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View Full Version : 368 LPE/Haibeck Dyno Results

Top Toy
07-22-2020, 07:44 PM
Time for another good dyno report... Marc just finished a round of upgrades on my new-to-me '95 (replaced my wrecked '93 last year). The car was originally modified to a 368 by Lingenfelter, then breathed on by DRM but never reached its potential. Everything was pretty much sub-optimal. Last recorded dyno before sending the car off to Marc was around 420 RWHP. Pretty mediocre for a 368. Pulled 486 SAE RWHP/405 ft. lbs. torque on the dyno yesterday. That equates to 572 crank HP. Not bad for a 30+ year old design. Kudos to Marc for another outstanding piece of work!
Hib Halverson
07-22-2020, 08:59 PM
486 SAE at the tire?
Wow. Impressive. Can beat Haibeck's stuff, that's for sure.

At what RPM were peak power and torque?
Top Toy
07-22-2020, 09:02 PM
486 SAE at the tire?
Wow. Impressive. Can beat Haibeck's stuff, that's for sure.

At what RPM were peak power and torque?

Peak torque around 5200 RPM and power basically flat from 6500 to 7100 RPM.
Young1
07-22-2020, 10:08 PM
Wow that is something. Did Mark just computer tune it only? Did he re time the cams?
tccrab
07-22-2020, 10:09 PM
Peak torque around 5200 RPM and power basically flat from 6500 to 7100 RPM.


Just a guess, but I'll bet you'll be replacing the rear tires fairly often.......


Enjoy the madness!!!


'Crabs
Top Toy
07-22-2020, 10:38 PM
Wow that is something. Did Mark just computer tune it only? Did he re time the cams?

Pure stock, just a tune... kidding, of course. Top end porting (including siamesed plenum and injector housings), medium weight (20 lb.) flywheel, cams, headers and 3" exhaust. Well, at least the air filter is stock.😏
Hib Halverson
07-23-2020, 01:45 AM
When you say "cams"...do you mean stock cams which have had their timing changed or do you mean cams with more aggressive profiles.

If the latter tell us about the cam profiles.
HAWAIIZR-1
07-23-2020, 02:08 AM
Wow Dennis! That?s awesome. Enjoy the new power in your new toy!! [emoji1303]🤙🏼


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Top Toy
07-23-2020, 07:56 AM
When you say "cams"...do you mean stock cams which have had their timing changed or do you mean cams with more aggressive profiles.

If the latter tell us about the cam profiles.

Custom cams Intake 243 deg. duration, 0.449" lift
Exhaust 222 deg. duration, 0.442" lift
Karl
07-23-2020, 12:24 PM
Are you using the stock clutch with the 20lb flywheel?
Top Toy
07-23-2020, 01:00 PM
Are you using the stock clutch with the 20lb flywheel?

Yes, stock Valeo.
JThomas
07-23-2020, 02:50 PM
Congratulations, I can't wait to see that ride. Glad you are doing well! :cheers:
Prez1967
07-24-2020, 08:18 AM
impressive numbers! I bet she'll be a riot on the street now
Paul Workman
07-26-2020, 07:46 AM
Beautiful! Oh, you're gonna like that. Very flat torque curve means "power" just about everywhere!

Fantastic job, Marc!!
Top Toy
07-28-2020, 09:47 AM
Picked up the car last night. Very happy with the engine paint, too! Can't wait to get it out!12527

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Top Toy
07-30-2020, 06:04 AM
Drove the car for the first time last evening. WOW! Gives new meaning to the phrase "Sit down, shut up, and hang on!". But perfect street manners, too. No compromises here. One of the Corvette hobby's best kept secrets!!

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rkreigh
07-30-2020, 09:56 AM
awesome numbers from 368 and Marc will squeeze ever pony that can be had
Top Toy
07-30-2020, 10:31 AM
Well, actually, there are a few more to be found. After looking at the DynoJet file, I see that the actual peak got smoothed over because of some noise in that part of the curve. The actual peak was 491 SAE. Probably a few more above that to be had with some other minor tweaks. The fun is just beginning!
Hib Halverson
07-31-2020, 12:20 PM
As I said earlier, Marc's stuff is freakin' incredible.

Just for perspective, attached is the last chassis dyno data from my '12 ZO6. Which has a mild Katech LS7 in it. I'm making 537.64* at the tire at about the same RPM as is "Top Toy" from 427 cuin. and he's making 491 from a 368.

Freakin' awesome engine you have!

*610 flywheel using a C6 12% Correction.
XfireZ51
07-31-2020, 12:51 PM
Hib,

That also says something about the LT-5 platform. People like Marc and Pete get great numbers and they do it without support from the aftermarket. Just massaging what?s already there. GM can be very frustrating in their decision making.
Top Toy
07-31-2020, 11:04 PM
Was a great evening to get the car out. Anybody know where I can find a sympathy card for a gray Tesla S owner?

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XfireZ51
07-31-2020, 11:47 PM
Was a great evening to get the car out. Anybody know where I can find a sympathy card for a gray Tesla S owner?

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🤣🤣🤣👍
Paul Workman
08-02-2020, 07:44 AM
Was a great evening to get the car out. Anybody know where I can find a sympathy card for a gray Tesla S owner?

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:sign10:
tf95ZR1
08-02-2020, 09:17 PM
Was a great evening to get the car out. Anybody know where I can find a sympathy card for a gray Tesla S owner?


:thumbsup: