SPAL FANS and 2 ROW DEWITT'S TECH Notes - Page 3 - ZR-1 Net Registry Forums

GOLDCYLON · 06-24-2013

Quote:

Originally Posted by tf95ZR1

Hey be careful, GC.
Aren't they a supporting vendor here?
Don't want to be banned.....

Oh wait, you're a mod!

No Idea reguardless they should have told me when I paid them it would be a week before it went out the door.

RHanselman · 06-26-2013

Take a look at this guy's custom Dewitt unit... Pretty slick...

http://forums.corvetteforum.com/c4-f...-corvette.html

GOLDCYLON · 06-26-2013

Quote:

Originally Posted by RHanselman

Take a look at this guy's custom Dewitt unit... Pretty slick...

http://forums.corvetteforum.com/c4-f...-corvette.html

Thats a little more than I was looking for Ron. However, for that application it sure made his clearnce issues go away. IM sure that was not cheap. GC

RHanselman · 07-05-2013

Quote:

Originally Posted by GOLDCYLON

Thats a little more than I was looking for Ron. However, for that application it sure made his clearnce issues go away. IM sure that was not cheap. GC

Yep I figured but it is cool no pun untended... Not cheap is probably right...

Did you get a chance to install? I'm interested in your results.

Cheers,

GOLDCYLON · 07-06-2013

Yep installed resolving an AC issue at the moment although

vilant · 07-07-2013

Was curious, if you the saw the post (can't remember where or who did it) where they removed sections of the front wheels wells with screen to help bring in air flow to the engine compartment. Have you done this mod? It may help keep things cooler in those hot desert climates your driving in.

A26B · 07-07-2013

I have the Ron Davis in my ZR-1

The Ron Davis is a racing radiator that has 5 cores as compared to the stock 2 core. As a "racing radiator" it performs best at racing speeds where air velocity is high. Being thicker, actually makes it more resistant to air flow than the 2 core radiator.

A simple but effective modification that yields significant results, is to drill 3 or 4 holes in the thermostat flange, just inside of the seal contact area. This modification reduces back-pressure for coolant passing through the radiator & thermostat and therefore allows more flow coolant through the radiator, instead of the bypass. Bypassed coolant means hotter temps.

I strongly suggest you perform the t-stat modification before spending a lot of time & money on expensive radiators and fans.

As a side note, the only way to insure the stock radiator is as effective as it can be.... is to remove it and insure all the gravel & debris is removed and the vanes are reasonably straight.

GOLDCYLON · 07-08-2013

Well Everthing is in I will give you my impressions after the drive home. AC issue was a pressure switch leaking next to the suitcase.

Dewits drilled out the spal fans brackets backwards which was a PITA. Had to reverse the back and tap and die them out the other side.

GC

GOLDCYLON · 07-18-2013

Well went with the all Aluminum 2 row and the spal fans. Solved my cooling problem so far in Phoenix. I also installed the R Woods 160 degree thermostat I have had for several years in my parts bin.

Two Mondays ago Freeway reading on I-17 for the outside temp on the HVAC controls swung from 122-119 on the drive home on that day the raditaor rose to almost 75%-80% of temp band prob 225. AC was on full.

The Fans roar with a pitch that you normally hear on the newer cars (Plenty of air movement). You will gain a little more room in the front of the motor as the back side of the OEM shroud with the OEM fans are no longer used. The receiver drier needs to shift a little towards the passenger side but the same bracket can be retained.

Notes on this project: There is a 2 week flash to bang time for delivery once you pay. I learned this the hard way, Also as mentioned above the SPAL Fan brackets mounting screwholes were made upside down from the factory so we had to retap and turn the bracket the right way to get it to work. Kind of a PITA

Plan on spending $900 in parts just to do this project. There are no discounts. I'm happy with the results however beware of the timelines and problem issues.

I also do have one additional comment. If you are running a bone stock LT5 the stock factory radiator if its clean and free of debris, silt and sand will work well. I did not have cooling problems until after I stroked my motor, installed bigger inake cams etc. This stands to reason more HP requires better cooling options than stock. The same logic follows for beefing up braking and the rear end, transmission etc to handle the extra HP and Torque. GC

RHanselman · 07-18-2013

Daryl,

Just wondering, what kind of HP/TQ you getting from that 380?

06-26-2013	#22
RHanselman Join Date: Jul 2005 Location: Cresson, TX Posts: 970	Re: Wtb Dewitt's radiator and spal fans Take a look at this guy's custom Dewitt unit... Pretty slick... http://forums.corvetteforum.com/c4-f...-corvette.html __________________ Ron Hanselman Founding Member #80 CM Lifetime Member #1093 1991 #383 Twin Turbo 1993 #099 Ruby, Jeal 368 w/Snake Skinner body 1961 White with Red Int

07-06-2013	#25
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: Wtb Dewitt's radiator and spal fans Yep installed resolving an AC issue at the moment although __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V

07-07-2013	#26
vilant Join Date: Jun 2012 Location: PA Posts: 772	Re: Wtb Dewitt's radiator and spal fans Was curious, if you the saw the post (can't remember where or who did it) where they removed sections of the front wheels wells with screen to help bring in air flow to the engine compartment. Have you done this mod? It may help keep things cooler in those hot desert climates your driving in. __________________ Joe 1990 Bright Red ZR-1 #2599

07-07-2013	#27
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,394	Re: Wtb Dewitt's radiator and spal fans I have the Ron Davis in my ZR-1 The Ron Davis is a racing radiator that has 5 cores as compared to the stock 2 core. As a "racing radiator" it performs best at racing speeds where air velocity is high. Being thicker, actually makes it more resistant to air flow than the 2 core radiator. A simple but effective modification that yields significant results, is to drill 3 or 4 holes in the thermostat flange, just inside of the seal contact area. This modification reduces back-pressure for coolant passing through the radiator & thermostat and therefore allows more flow coolant through the radiator, instead of the bypass. Bypassed coolant means hotter temps. I strongly suggest you perform the t-stat modification before spending a lot of time & money on expensive radiators and fans. As a side note, the only way to insure the stock radiator is as effective as it can be.... is to remove it and insure all the gravel & debris is removed and the vanes are reasonably straight. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.

07-08-2013	#28
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: Wtb Dewitt's radiator and spal fans Well Everthing is in I will give you my impressions after the drive home. AC issue was a pressure switch leaking next to the suitcase. Dewits drilled out the spal fans brackets backwards which was a PITA. Had to reverse the back and tap and die them out the other side. GC __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V Last edited by GOLDCYLON; 07-08-2013 at 12:26 PM.

07-18-2013	#29
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: Wtb Dewitt's radiator and spal fans Well went with the all Aluminum 2 row and the spal fans. Solved my cooling problem so far in Phoenix. I also installed the R Woods 160 degree thermostat I have had for several years in my parts bin. Two Mondays ago Freeway reading on I-17 for the outside temp on the HVAC controls swung from 122-119 on the drive home on that day the raditaor rose to almost 75%-80% of temp band prob 225. AC was on full. The Fans roar with a pitch that you normally hear on the newer cars (Plenty of air movement). You will gain a little more room in the front of the motor as the back side of the OEM shroud with the OEM fans are no longer used. The receiver drier needs to shift a little towards the passenger side but the same bracket can be retained. Notes on this project: There is a 2 week flash to bang time for delivery once you pay. I learned this the hard way, Also as mentioned above the SPAL Fan brackets mounting screwholes were made upside down from the factory so we had to retap and turn the bracket the right way to get it to work. Kind of a PITA Plan on spending $900 in parts just to do this project. There are no discounts. I'm happy with the results however beware of the timelines and problem issues. I also do have one additional comment. If you are running a bone stock LT5 the stock factory radiator if its clean and free of debris, silt and sand will work well. I did not have cooling problems until after I stroked my motor, installed bigger inake cams etc. This stands to reason more HP requires better cooling options than stock. The same logic follows for beefing up braking and the rear end, transmission etc to handle the extra HP and Torque. GC __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V Last edited by GOLDCYLON; 07-18-2013 at 02:18 PM.

07-18-2013	#30
RHanselman Join Date: Jul 2005 Location: Cresson, TX Posts: 970	Re: SPAL FANS and 2 ROW DEWITT'S TECH Notes Daryl, Just wondering, what kind of HP/TQ you getting from that 380? __________________ Ron Hanselman Founding Member #80 CM Lifetime Member #1093 1991 #383 Twin Turbo 1993 #099 Ruby, Jeal 368 w/Snake Skinner body 1961 White with Red Int