A Couple Of Newb Questions - ZR-1 Net Registry Forums

Scottys72 · 01-19-2008

First of let me say what an excellent forum this is - I have been poring over all of the Tech/FAQ/Tips sections and learned an awful lot in just the few weeks I've been here.

1) In the For Sale section one of the sellers mentions that the 93 to 95 405HP LT-5's has 4 bolt mains and the 90 to 92 cars have 2 bolt - I've been looking for this but can't find an answer - the ZR-1 site says the only difference was the intake and injector updates that accomplished the HP increase - nowhere does it mention a different bottom end - are there two different bottom ends on the LT-5?

2) I have been looking for suspension upgrades and perhaps an auto-X or weekend warrior section, is there a specific section here that I'm missing?

TIA

Scott

01-19-2008

Scott, yes on ofthe upgrades in the later 93-95 motors was a 4 bolt bottom end. It doesn't make any difference in hp. The only thing that does affect hp is the injector housing revision & a small change in camshafts. There was no change to the intake manifold other than adding in the EGR port on the passenger side.

On the autoX, the ZR-1 is heavily penalized with the extra weight up front, and also with most courses now being designed and better suited toward the Mini, WRX and other small cars. The ZR-1 really shines on the road course where you can stretch the legs.

For suspension mods you are kind of limited to the usual sway bars, coilovers, some geometry brackets and heim jointed end links.

Scottys72 · 01-19-2008

Thanks Jeff - actually got my Cobra beat by a heavily-modified series 1 Miata last year, when I went to talk to the Guy he was pretty rude - so I asked him if his wife knew he drove her car on Sundays, my point being that you can put a Wiley-E-Coyote-Acme-Rocket-Booster in a Chevette, it'll be fast but it'll still be a Chevette!!

On the other hand I've never received anything but positive comments from the 'Vette contingent - usually helping me with the line and brake points as well. Also, just like the Cobra - everyone stops to watch a 'Vette through the cones. My goal is more with having fun than winning National Championships and I'll bet a stock Z will be PDQ in stock form.

Thing is a prefer the black belt-line look of the '90. Can I assume that unless I'm redlined for longer periods of time the 2 bolt main motors will be fine? Also, with an exhaust, your chip and a PNWZR1 intake port and polish will get me close on 400 FWHP?

Scott

Aurora40 · 01-19-2008

Quote:

Originally Posted by Scottys72

Thing is a prefer the black belt-line look of the '90/'91's. Can I assume that unless I'm redlined for longer periods of time the 2 bolt main motors will be fine? Also, with an exhaust, your chip and a PNWZR1 intake port and polish will get me close on 400 FWHP?

Only the 1990 has the black beltline (unless the '91-95 is a black car...).

I don't believe there's any durability concern with the 2-bolt motors. It's not like a conventional SBC, the bolts hold on this fairly big ladder frame thing that supports the bearings. I believe it's a lot more stout than "2-bolt" suggests.

On the power, FWIW, my 1990 has headers, top end porting, and a custom exhaust. It made 385whp on the dyno. I would reasonably say that this is over 400FWHP. If I were to guess I'd say closer to 450, and fairly definitely over 425.

Scottys72 · 01-19-2008

Ok - missed the belt line year- thanks Bob - sounds like a main web girdle also those are great numbers for just the easy (relatively) mods you've listed - I am quickly learning just how impressive the LT-5 is....

Thanks

Scott

Scottys72 · 01-20-2008

Damn Bob - I just saw your '90 in the Rides section - stunning - really nice - hope you don't mind if I pester you about detailing once in a while?

Scott

Aurora40 · 01-20-2008

Quote:

Originally Posted by Scottys72

Damn Bob - I just saw your '90 in the Rides section - stunning - really nice - hope you don't mind if I pester you about detailing once in a while?

Scott

Heheh, there are probably 500 Z's exactly like mine, and 1000's faster. But thanks for the compliment!

I don't mind at all if you pester me. Feel free to shoot me an email if you prefer: corvettezr1990 at aol . com

bradslt5 · 01-20-2008

do you use a porter cable da on your car if so what products and pads do you use. i am getting ready to color sand my red car and wondered if you use something special for red.?

Scottys72 · 01-20-2008

Most use electric - slower and softer than air.

IMHO

Scott

01-19-2008	#1
Scottys72 Join Date: Dec 2007 Location: Ottawa ON Posts: 15	A Couple Of Newb Questions First of let me say what an excellent forum this is - I have been poring over all of the Tech/FAQ/Tips sections and learned an awful lot in just the few weeks I've been here. 1) In the For Sale section one of the sellers mentions that the 93 to 95 405HP LT-5's has 4 bolt mains and the 90 to 92 cars have 2 bolt - I've been looking for this but can't find an answer - the ZR-1 site says the only difference was the intake and injector updates that accomplished the HP increase - nowhere does it mention a different bottom end - are there two different bottom ends on the LT-5? 2) I have been looking for suspension upgrades and perhaps an auto-X or weekend warrior section, is there a specific section here that I'm missing? TIA Scott

01-19-2008	#2
Jeffvette Guest Posts: n/a	Re: A Couple Of Newb Questions Scott, yes on ofthe upgrades in the later 93-95 motors was a 4 bolt bottom end. It doesn't make any difference in hp. The only thing that does affect hp is the injector housing revision & a small change in camshafts. There was no change to the intake manifold other than adding in the EGR port on the passenger side. On the autoX, the ZR-1 is heavily penalized with the extra weight up front, and also with most courses now being designed and better suited toward the Mini, WRX and other small cars. The ZR-1 really shines on the road course where you can stretch the legs. For suspension mods you are kind of limited to the usual sway bars, coilovers, some geometry brackets and heim jointed end links.

01-19-2008	#3
Scottys72 Join Date: Dec 2007 Location: Ottawa ON Posts: 15	Re: A Couple Of Newb Questions Thanks Jeff - actually got my Cobra beat by a heavily-modified series 1 Miata last year, when I went to talk to the Guy he was pretty rude - so I asked him if his wife knew he drove her car on Sundays, my point being that you can put a Wiley-E-Coyote-Acme-Rocket-Booster in a Chevette, it'll be fast but it'll still be a Chevette!! On the other hand I've never received anything but positive comments from the 'Vette contingent - usually helping me with the line and brake points as well. Also, just like the Cobra - everyone stops to watch a 'Vette through the cones. My goal is more with having fun than winning National Championships and I'll bet a stock Z will be PDQ in stock form. Thing is a prefer the black belt-line look of the '90. Can I assume that unless I'm redlined for longer periods of time the 2 bolt main motors will be fine? Also, with an exhaust, your chip and a PNWZR1 intake port and polish will get me close on 400 FWHP? Scott Last edited by Scottys72; 01-20-2008 at 01:29 PM.

01-19-2008	#5
Scottys72 Join Date: Dec 2007 Location: Ottawa ON Posts: 15	Re: A Couple Of Newb Questions Ok - missed the belt line year- thanks Bob - sounds like a main web girdle also those are great numbers for just the easy (relatively) mods you've listed - I am quickly learning just how impressive the LT-5 is.... Thanks Scott Last edited by Scottys72; 01-19-2008 at 08:58 PM.

01-20-2008	#6
Scottys72 Join Date: Dec 2007 Location: Ottawa ON Posts: 15	Re: A Couple Of Newb Questions Damn Bob - I just saw your '90 in the Rides section - stunning - really nice - hope you don't mind if I pester you about detailing once in a while? Scott

01-20-2008	#8
bradslt5 Join Date: Oct 2007 Location: lone pine and mammoth lakes ca. Posts: 544	Re: A Couple Of Newb Questions do you use a porter cable da on your car if so what products and pads do you use. i am getting ready to color sand my red car and wondered if you use something special for red.?

01-20-2008	#9
Scottys72 Join Date: Dec 2007 Location: Ottawa ON Posts: 15	Re: A Couple Of Newb Questions Most use electric - slower and softer than air. IMHO Scott Last edited by Scottys72; 01-20-2008 at 09:45 PM.