blue_bomber697

Hey guys, my previous issue is slightly improved, but still not fixed! Car is not performing up to the potential I believe it has.

834whp/710ft-lbs, M7 Stingray and I am trapping around 135-136 in the 1/4 mile. All the evidence I can see is, I should be above 140mph. There are cars with far less hp or far more weight running faster than me and I believe the car is not running up to its potential.

We initially thought it was an IAT sensor issue reading too hot since it wasn't relocated. Now it is relocated and IAT's are much better now. However I am still running the original MAP sensor and BARO is still in its original place.

Is there a possibility that the MAP/Baro not being changed is what is slowing me down or do I have another issue do you guys think? The car is making the power on the dyno, but not living up to the numbers on the strip.

I am in Canada and we don't really have shops familiar with high powered Stingrays. Mine is 3rd highest in the country I believe and the other 2 are on the other side.

Highlight mods are: LPE built 416, ECS1500 pullied down, cam, heads, dual meth, ARH headers.

Thanks for any help, trying to get this car in better shape by my October rental.

T/A KID

I see this sometimes times in these cars... log tq management spark on a dead stop pull and see if it's kicking in in the lower rpms....
i see cars make great dyno numbers but aren't fast at the tack Bc of this...

DOUG @ ECS

834 rwhp should be near 150 MPH, maybe post up some logs?

blue_bomber697

I'm working on getting some done. My tuner won't take it to log cause his license is near full on points. I don't have a cable or the software but I'm working on borrowing a cable.

But yeah, something really seems off and I can't figure out what.

blown81bu

700 RWHP will get u 140++mph trap speed

Bad Jake28

This seems to be a very high hp number for this setup. I have the same 416/ecs 1500 combo (3.75 pulley) and we were only able to make 734 rwhp on a heavy load mustang dyno. We are still fighting iat's with the breakout harness and a custom charge pipe. Maybe a different dyno would give you a rwhp number more in sync with your track times

FYREANT

Actually, with his mods I would've expected a little bit more power. I have roughly the same build, and pulled 828hp and 717tq and I'm not on a stroker 416, but rather the regular 376 cubes.

Bad Jake28

yes sir you would expect bigger numbers from the larger cube motor. However with my car the 1500 just couldn't keep up with the motor. Obviously many factors are at work here i.e. cam specs, compression ratio, etc. The 2200 will solve my issues this "off season" so having been down this road this just seemed like a very high hp number. From what i hear many stock cube motors are making more power than the 416's with the smaller blower

blue_bomber697

I have custom low comp pistons if that makes a difference. I made 834/710 on one dyno, and 804/720 on another mobile dyno in less favourable conditions. On a Mustang dyno however it would probably read a high 700's number as they read lower.

Bad Jake28

yes. The lower compression ratio will work the little 1500 even harder. I would have to think that you are still fighting iats and heat soak. Working the blower that hard puts tremendous heat under the hood. And with this heat the computer is sure to pull timing. Sounds like you need the 2200 head unit

E.A.

If you're talking about HPTuners, it doesn't cost any licenses to log.

You can log any car, anytime, for free and share that data.
Heck you can do it with and SCT tool, or Diablo for free as well.


Log car, share info with Doug and life will be grand.

0Billy@MTI

I am willing to bet the Tb blade isn't staying open

blue_bomber697

The license I was referring to was his drivers license haha. As in if he gets one more ticket, he gets it suspended.


But yes, I have some logs done, going out again tonight and checking a couple more parameters for my tuner to look at.

Couple things I noticed: Fuel pressure drops when I start getting into power, and while Commanded Throttle is at 100%, the actual throttle given seems to vary between 60% & 84% depending on my gear. I was told 84% is actually 100% though on this new generation and that's just an HP Tuners calibration thing.

I have an LS9 MAP sensor w/ breakout kit and CPR's low pressure fuel system on the way right now, and hopefully with that stuff and some stuff found in the logs I can get this car running what its supposed to run on the track.

blue_bomber697

Was something I was thinking of as well. Throttle percentages were pretty wacky in the logs.

Cordes Performance Racing

if throttle position is all over the place sounds like the tuner doesn't know how to scale the torque values correctly and it's shutting you down. solid way to smoke an auto btw.

blue_bomber697

As soon as I can get some more logs in (hopefully tonight), Ill pull the tune as well and see if you can see anything obvious.

We don't have big name performance shops here like you guys do in the USA. This is the best I have and its 500kms away from me. The tuner builds wicked fast (7-8s) LS cars but mine is the I believe the fastest DI car he has ever done and by far the most powerful C7. Heavily modded C7's are very rare in Canada and so most shops don't have the experience you guys do on them.