Guys I have a Quik Queston maybe someone could diagnose. Then syptoms are as follows, It Idles just fine however when stomp on the gas it falls on its face for about a second then it catchs itself and starts going. It will do this whether or not im in boost or not or any rpm range, it only does it when I stomp on it. It doesn't do this if I gradually apply pressure to the pedal.
What I have done to the car is as follows: "Its an 88TII"
rewired The fuel pump
fully Grounded car
RP fuel pump
S5 Turbo
no acv
RTech S4TII chip
no airpump
And the intake and full exhaust! No cats.
s5 Fuel Rail
And alot of other goodies but they are unrelated to the problem.
Please could I get some direction as to what to do or check out, I just need some advice as to whats causing this. Yes I know your thinking 3800 rpm hesitation and no thats not it! And yes I have search the archives and have come up with everything from an loose vac line to no pill in the boost sensor. I just need someone who has had similar problems and what they have done! Thanks alot for any help guys!

 

When was the last time you injectors were cleaned and balanced? I am no guru but that is something to consider.

 

Well I have new primarys and the secondarys were cleaned 2 months ago! Im sure its something else because its not at any particular rpm range, only when I mash the pedal!
Thanks for the reply!
Any other suggestions

 

Have you done the TB mod? Sounds like it.

 

I did the TB mod and I had no problems like that.
You check out the TPS?

 

did it do this before u had the Rtech chip??? if so it might be that the chip is flawed somehow. cause the chips control the WOT setting, hence a momentary rich, and teh car stumbles.

just my .02

--joe

 

Actually I forgot to mention that I also have the throttlebody mod done"Secondary plates and cold start removed" Also the chip is great and no it did this before I got the chip! I definintly recommend the chip! So do you thinks the TB mod has something to do with it?
Thanks again guys
Keep the replys coming

 

The whole point of the TB mod is to remove the #2 secondary throttles, which on Turbos (not NA's) are damped so they open a bit slower than the #1 secondary throttes downstream. This is to stop the stumble caused by the secondary ports suddenly opening up.

Removing the #2 secondary throttles improves throttle response (because the secondary ports now flowing earlier), but if you slam them open, it causes a stumble (whch is why the system was there in the first place). You just learn to drive in a manner that avoids this.

Did you notice this problem only after dong the TB mod? It should only be a momentary problem. A big hiccup then it's OK. If it's worse than that then it's something else.

 

Well to be honest, when I got the car I hadn't even driven it before I started modding it. So I don't know If this problem accured before or not! What If its not this what else could cause this! Say, it does it only when boosting! Again I have an S5 turbo and when I installed it their was one extra vac line on the comp housing that the S4 didn't have I didn't know what to do with It so I capped it!

 

well...check your TPS. Thats the only other thing that comes to mind.

 

my car used to do that before i blew a corner seal. check your compression and do a basic tune up

 

Well, I don't think thats the problem. It runs fine as long as you drive it normal and don't dog on the gas, It just seems like when I dog it in the boost range it does it and it always does it when Im boosting. If I boost slowly it doesn't do it. The original motor is in the car and it only has 52,000 miles on it so I would think my corner seals still have some life! Again this is an 88TII "10THAE"
Anyone think when I switched the s5 turbo in I could have maybe capped off the wrong line or forgot to hook one up! Would that cause this?
Please Help this is frustrating as helllllll!!!!!!

 

Like I said, if this is just a big hiccup if you slam the throttle open, then it's just a side-effect of the TB mod and nothing to worry about. Learn to open the throttle a little slower.

 

I would like to know where did you get that Rtech chip ?
Also how much did it cost, and what benefits do you get from the chip ?

 

www.digitaltuning.com

 

The address above is were I got it! I did the self install and I used 2 spacer grommets in place of the original chips so that when I want to convert it back I can just plug them in instead of having to resolder everything. Also unless you have some experience playing with PC board and taking out chips, I would just pay the extra and have them do it! You also really need to have the right tools to do this as well as the proper soldering gun! It need to be a 30 watt gun max! I love the chip, It does exactly what the say it does and works very well. Its also super clean!