I haven't received my graph yet from UPREV, but he said I was running pretty lean due to the cats now.

Taking off in 1st it happened to me a lot because of the load and the gear. They even had it happen to them on the dyno engaging first.

 

If you can get yours custom tuned not just a flash from TS, that would fix your problem. You just need to get your A/F adjusted.

 

I don't believe they will be able to fix their problem with the cats. It's just the way the car reacts to HFCs or Test Pipes.

 

TS actually custom tuned the car. A/F was adjusted as it was seriously running lean.

 

Then you shouldn't be having the issue. Strange. What is your A/F on the graph? Around 12.5-13.5?

 

Does this go for me too? How do I go about getting a custom tune? If I would have known the HFC's do this I would have not bought them. I wonder if there are others having this issue running HFC's or TP's?

 

Yea I had no idea either till I got them. Now that we mention the problem it seems others have it too. LOL!

It would be worse with TP's.

Many tuners here can tune your car. You can find a tuner in your area that does UPREV or Technosquare and have it custom tuned on the dyno to fix your A/F that should solve the problem. But someone here said their Technosquare didn't so maybe UPREV is better in this area as it is adjusting the stock ECU itself and not a piggyback.

 

will i have any problems in the long run for the car runnin LEAN?

 

Well I guess I'll have to go for the UPREV. Damm more money down the drain. I was going to stop for a while on my HR because, I have a 1982 280zx Turbo
that I just completed restoring and upgrading and that pretty much sucked me bone dry.But I gotta do what I gotta do it's just going to have to wait.The wife is going to have a **** fit.

 

Car is running good now Problem has resolved on it's own.

 

WHAT are you serious?

You didn't do anything to fix the problem?

Congratulations! I've been suffering since I installed the HFC's.

 

how

 

I have the Berk HFC's and I'm also experiencing the hesitation problem. I was going to get the TS reflash in hopes that it would fix the problem, but that doesn't seem to be the case.

I'm not sure where I can get a custom tune in my area (Pittsburgh, PA). Are there any other options?

 

I only had the car hesitate on me once out of the entire 8 months that I have owned Berk HFCs..

Well if I recall Berk have upgraded their HFCs..i believe they increased their diameter to 2.5" now..

I have the 2.25" HFCs and I have no hesitation problems. I know this may make no sense but maybe it's the 2.5" diameter on the new HFCs that may be the cause..

 

FYI... Technosquare was unable to remedy the problem even with a custom tune. My plan is to install my stock cats back on unless someone figures out a fix soon.

 

Dont know? Just drove the car and like 2 weeks later it was gone.

 

Yeah, I have the new 2.25 HFC's.

 

I honestly dont notice it in 1st or 2nd because they go by so fast. But 3rd gear like I said before, around 2k and do a stomp and mine was pretty bad. I never resseted my ecu because I was told it would learn on its own and wasnt required. Dunno if thats the case

 

I don't have the Berk HFCs, but I get this sputtering also. Has anyone noticed their limited "slip" light on the dash fluttering on and off at the same time?

 

It' suppose to do that when your VDC kicks on.