512ISF

iTrader: (1)

I finally got around to dynoing today.

6th gear,sport mode, rr tuned intake box open with fan directed at it.

mods:
ppe headers
rr tune and intake
full 3inch custom exhaust catless with x pipe
joe z elbow

results:
385hp/368tq


Any ideas what could be holding back the car from the 400+ that everyone else is hitting?

moleb

should have dyno before bolt ons, then after imho. Thats what I'm doing. I'm also taking it to the track after every mod i do.

so far stock i dynod 348whp, and ran 12.7 1/4 at 112mph. just installed borla exhaust so now I will be going back to track and dyno it see the gains.

i think you should go to the 1/4 to be honest. If you trap over 115mph and run below 12.5 then your mods were useful imho.

MileHIFcar

I wouldn't be too worried about the numbers honestly. I've found out that the ISF is SUPER finicky on the dyno if it doesn't see the right conditions. Example I dynoed my car when it was stock and it put down 357 whp and then after when I put on the Borla exhaust and I think I lost 5 hp lol..........

After that and researching here on CL I've come to the realization that this car doesn't like dynos like some other dyno queens and it doesn't mean that your not making north of 400+ whp because you are!

There is no way to simulate road speed at 60 mph+ with some of these fans that these shops use, and I think that's one of the problems with the ISF and it's computers that pull timing if they don't see something equivalent with IAT at higher speeds.

Trust me I was disappointed too but I soon got over it and have never went back to the dyno and I'm FBO and honestly don't care to see what I'm putting down. I know that my car is pretty fast for what it is in it's current state of tune based on the wins I've had down in Mexico every weekend. I've raced over 75+ cars at least over the past year since being FBO and although I don't win every race the ones I do win validate that the car is putting out what it's supposed to when RR engineered the tune for the associating mods

Just my 2c

512ISF

iTrader: (1)

I did dyno stock as well 345/308. And ran around a 13.0 1/4.

With current mods my best is 12.5x with 114/116.

512ISF

iTrader: (1)

You definitely have a point. The car does well in Mexico as is. I haven't managed to crack below 12.5 at the track but it still is running decent. It'll be interesting to see what my tuner is able to do with the custom tuning.

jspecvtec

iTrader: (4)

can't be disappointed if you don't know what the baseline numbers were and the weather conditions of the dyno days

mahcah

iTrader: (3)

Generally people expect 400+ with those mods so I understand why OP is disappointed. True a baseline should have been done and there are variables that affect dyno results. But with many cases of 400+ on that set up, it is hard not to expect the same or something near it for your own car.

512ISF

iTrader: (1)

I did baseline, made 345/308. Tq gains were decent hp not so much. When overlayed it made good gains through mid rpms but the top end peak gains were not as impressive.

Supraman16

iTrader: (5)

One thing I've noticed with my FBO is that it's very sensitive to the quality of the gasoline. What octane were you running? If it's 91 oct, you may want to run a small amount of E85 to bring up the octane a bit. I believe people have had good luck with mixing about 3 gallons of E85 with a full tank of premium gasoline to make the FBO tuned F's run like they are supposed to.

JDMV8

iTrader: (6)

Go dyno at another shop. They can make your graph show 500hp if you want.
My point is that 40hp and 60 ftlb peak gain from pipes and a tune is incredible....LOL
Blame your car for baselining so low

j3ff

agreed. Those are solid gains that you're putting down. It's always the delta that matters.

Defratos

Well last time I did my Dyno with PPE Heades and Joe-Z exhaust I got 370whp, was very disappointed and a few weeks later I had to change my exhaust to OEM one and found I had a decent exhaust leak in the header/exhaust connection area.

jdmSW20

iTrader: (12)

Yeah a lot of folks get caught up on the numbers but its more about the gain before and after. Like JDMV8 said, those aren't bad gains at all

Jz39

iTrader: (2)

It's really all about the 1/4 times IMO. No matter what the numbers say, if your car isn't faster at the track, life sucks!

lobuxracer

iTrader: (2)

Actually it's all about trap speed. Times are driver dependent and only matter if you are concerned about winning a race. Trap speed tells you everything you need to know about horsepower. Higher speed, more horsepower. Lower speed, less horsepower. You also need to normalize based on density altitude because nothing is more important than the air pressure available to the engine. It is what boost is all about, and even boost is ambient air pressure dependent.

It surely makes sense to check everything and be sure you don't have an intake or exhaust leak hurting your numbers, but dyno numbers are only as good as the tester. From all indications, you did see a pretty impressive gain even if you didn't see the 400+ number you were expecting.

And peak engine torque numbers are meaningless. I have no idea why anyone bothers posting engine torque numbers because engine torque does not move your car, horsepower does.