C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

My first dyno== SAD =(

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Old Jun 22, 2002 | 07:08 PM
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Default My first dyno== SAD =(

I jus had my first dyno at dynotech in ft wayne indiana and here is what it says i hit 215hp and 320 tr this was done with the temp in the building at 100 degrees. It ran strong all the way to 5500 rpm. I cant believe my car is this sad!! I have a 383 with 58mm,fuel press reg,gutted MAF,cut lid/w K&N filter,ported plen ,hypertech cap/rotor,8.5 msd wires, my cam is a comp cam 268-(477-480) other then this my cars is stock i did do sum port and polish on the heads adn put in 2.02 valves in them can sum tell me what is wrong with my setup and /or whatever help JAY :confused:

also this was ran on a dynojet set up mach.


[Modified by jparr, 5:09 PM 6/22/2002]
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Old Jun 22, 2002 | 07:39 PM
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Default Re: My first dyno== SAD =( (jparr)

Yeah, Something is wrong here. My stock L98 is getting 231hp/315ft lbs.
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Old Jun 22, 2002 | 07:52 PM
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What heads & Intake are you using?
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Old Jun 22, 2002 | 07:54 PM
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Default Re: (scorp508)

Are you running a stock TPI intake and exhaust manifolds? That is your bottle neck if you are. My 88 with headers, duals and free mods made 245/328 at the wheels. You sound at least 75 hp lower than I would expect.
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Old Jun 22, 2002 | 11:24 PM
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Default Re: My first dyno== SAD =( (jparr)

Did they monitor your Air/fuel ratio with a wideband O2 sensor? It's quite possible the fuel curve is way off at WOT.
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Old Jun 23, 2002 | 12:41 AM
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Default Re: My first dyno== SAD =( (jparr)

scorp stock heads adn exh no they didnt monitor the air fuel o2
it was on a computer liek they do it on horsepowerTV jay
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Old Jun 23, 2002 | 12:45 AM
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Default Re: My first dyno== SAD =( (jparr)

If thats the CC flat tappet hyd cam, your cam is too weak. You should upgrade to a roller cam a little more aggressive.
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Old Jun 23, 2002 | 12:47 AM
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Default Re: (Fastguy)

Hey fastguy...your running a roller cam, don't forget. The TPI intake is good for well over 300 HP.
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Old Jun 23, 2002 | 01:58 AM
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Default Re: (BBA)

at what RPM's did the peak HP and Torque happen?
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Old Jun 23, 2002 | 02:04 AM
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Default Re: My first dyno== SAD =( (jparr)

ok when i was tested i was in drive not OD adn i had to get it to 70 mph then floor it. i went straight up on the chart then went down on an angle and this was with both hp and trq it was weird i wish i had a scanner i would post it jay
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Old Jun 23, 2002 | 03:24 AM
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Default Re: My first dyno== SAD =( (jparr)

Drive is the proper gear to be in because of the 1:1 ratio. Virtually 100% of dyno runs are brought up to ~ 2,500 rpm to ~ 3,000 rpm in drive (or fourth in a manual trans) and then a quick roll on of the throttle.

Its really too bad they didn't hook up some diagnostics. Outside of any mechanical ills you are likely to find malfuncioning sensor(s) or a totally whack computer program.

Best of luck,
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Old Jun 23, 2002 | 11:32 AM
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Default Re: My first dyno== SAD =( (jparr)

Is your chip stock? I would think you need some custom programming with you setup.

What about your injectors?

ToniH
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Old Jun 23, 2002 | 11:41 AM
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The TPI intake is good for well over 300 HP.
But the stock heads aren't. The 86/87 heads are good for about 300 untouched, and the 88-91 heads are good for about 350 untouched.

p.s.

If he has the stock 85 heads on there, those are complete junk for the most part. Also the stock manifolds will absolutely kill a 383s power.


[Modified by scorp508, 10:42 AM 6/23/2002]
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Old Jun 23, 2002 | 12:17 PM
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Default Re: (scorp508)

Also the stock manifolds will absolutely kill a 383s power.
He should still have over 215 HP. A stock Vette has 200 RWHP , easily.

Vic
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Old Jun 23, 2002 | 02:31 PM
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Default Re: My first dyno== SAD =( (jparr)

yes im running stock injectors
i have an ed wright chip
there was an 87 in front of me that got dynoed and it had 340 hp not sure torq he had sum head work exh adn a cam all done at lingenfelters
jay i do want to get a new top end setup mini or SR but im trying to buy a house for now. also my car isnt slow i have never been taken off the line
street racing but they always catch me and pass me about half way JAY
i also want to buy sum trick flow heads and have them gone thru?? i this stuff will help me as a package when im done with it


[Modified by jparr, 12:32 PM 6/23/2002]
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Old Jun 23, 2002 | 02:43 PM
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Default Re: My first dyno== SAD =( (jparr)

Wow dude, that's low HP, I got 210 HP on a crossfire with just 1.6 RR's and an Xram. Are stock injectors 19# or 24#, I think ya need more injector. I'm running 24# but will change to 30# sometime soon. :yesnod:
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Old Jun 23, 2002 | 03:51 PM
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Default Re: My first dyno== SAD =( (jparr)

If you can find a way to post your dyno graphs that will help a lot. BTW it's also possible for the dyno to not be calibrated properly.
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Old Jun 23, 2002 | 04:34 PM
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Default Re: My first dyno== SAD =( (Nathan Plemons)

DOn't mean to be rude, but are you sure you have a 383? Did you built it yourself or did you buy the car and the previous owner told you it was a 383? Don't laugh, this actually happens all the time! Because your number would be almost dead on if you didn't have that 383.

Just curious.
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Old Jun 23, 2002 | 06:12 PM
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Default Re: My first dyno== SAD =( (zelement)

DOn't mean to be rude, but are you sure you have a 383? Did you built it yourself or did you buy the car and the previous owner told you it was a 383? Don't laugh, this actually happens all the time! Because your number would be almost dead on if you didn't have that 383.

Just curious.
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Old Jun 23, 2002 | 08:14 PM
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Default Re: My first dyno== SAD =( (jparr)

zelemnet yes it is a 383 i had a freind and his brother build it for me
400 crack cast summit rebuild kit comp cams k kit stock rods and intake!!!
i know we had to put a 79 starter on teh motor for the fly had alot more teeth i think and it got a 8 in balancer on it and i belive its on teh outside
!!!
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