FDee

Hey Guys I recently put a F1A and meth kit on 16 Z06 and it did 903whp on the dyno with 18.7 lbs of boost. Took it to the track and it only ran a 10.5 and data logged the runs at 10lbs of boost... No belt slip or leaks, did a full leak and smoke test. Can't find the issue. Any ideas?

Thanks

Elvis beltran

What was your 60ft time and mph

0Billy@MTI

Was the throttle 100% all the way down the track?

T/A KID

FDee

1.98 60'

137 mph

FDee

Yes

FDee

1.98

137mph

JHEBERT

If you datalog your runs, I believe you may find the electronic throttle opening slowly, and then not staying fully open during the pass. Seek the help of a qualified tuner, such as T/Akid or Crawford racing. You are about the 100th person to have this issue

John

FDee

Thank you John.. That will be my next step

BooSSted

Curious to this... If it's that common, what is the cause with the tune and fix ?

0Crawford-Racing.com

As stated, there are several things tune related that need to be handled to get full throttle and power. That being said, more often then not, on a procharger, loss of boost comes from belt slip.
Shoot me an email if you need me to take a look at the logs and tune file.

chris@crawford-racing.com

blue_bomber697

I have this exact issue on my car. ECS1500 w/416 makes 830whp+ at 12lbs of boost on the dyno. At the track it only made 6lbs when datalogged and ran 10.59 @136.

From what I recall, we fixed my throttle programming so its 100% now, but my tuner figured it was belt slip at my last track day. Its going to a new tuner in a couple weeks so hopefully it gets fixed up, whether its belt slip or in the tune.

BooSSted

I think I'm having this problem with my car. Granted it's only had 2 passes on it, and it was hot as hell. But the car made 865 on pump 910 on E... on pump it was running 1.8 60' / 10.5 @ 137... Not where the car should be at that power. Cars already at a new tuner, had nothing but issues tune wise since the car left the original shop.

123sugey

A question .... do tuners just tune on the dyno these days ? Another question .... am I wrong thinking on big builds (high hp #’s) are not tuned on the street ? I thought that big builds at minimum would be dyno and street tuned .... for at least drivability. All tunes are not the same.

ajrothm

Yeah something definitely not jiving.... 137 mph is about 650-700 rwhp.. Gotta be the throttle blade closing some. Always check the BOV and make sure its sealing when its closed at WOT. I had a Tial BOV split an o ring and it would leak under boost.. I used to pressure up the whole charge side with my air compressor and hold it at 20 psi and soapy water check for leaks. That's also a good time to test your secondary systems that come on with boost pressure.


Ironically though, I see a lot of procharger C7Zs locally that WAY under perform from what their dyno sheet shows...Must be something these tuners are missing.


I'd be curious to see what you guys figure out...

FYREANT

I was tuned by a very reputable tuner, and I ran 9.92 at 140 with a 1.53 60 ft. Car made 850 rwhp and 730 rwtq. I know that my driver demand and torque tables were left at stock values though unfortunately..

T/A KID

BooSSted

I agree I see a lot of procharged Z's that are well off what their cars "should" be doing at the track. But I've seen a few other Callaway and spray cars I can say the same too.
137 MPH definitely is not indicative of 860+ whp...
Will definitely be doing more tuning once it stops snowing in the northeast. I fully expect at least a 9.9 car that can keep pulling on longer pulls. That was my purpose of going procharger. Dont need a track monster, but a car that can do well regardless the venue and conditions.

I was also tuned by a 'reputable' tuner .. At least you seen 9s. Great 60' , are you on a drag pack?

FYREANT

That was on 18” forgelines with MT ET Street SS 305/40/18. I actually ran a 10.02 at 140 also that day, and that was on different wheels and tires that I drove to the track on.. 19” Z51 replicas and 305/35/19 Nitto NT05R’s. Had a 1.67 60’ with those.

ajrothm

Yeah when I see bolt on C7Zs going 9.90@136-137 mph in good air, then the same night I see a cammed, F1A C7Z going 10.20@137..... I just shake my head.... $5k in bolt ons or $10k in a blower swap, + a $3k cam job...

Now I HAVE seen some F1 cars getting into the mid to high 9s but.....not near as common or easy as the stock blower cars, believe it or not... But if you want to go faster then 9.60s, you HAVE to do a blower swap...and a converter, and a cam, and blah blah blah....

You know how it goes from there.

No doubt a procharger car will yank a stock blower car out on the highway tho....