Question about FI / Innovate
 

I was over with Bill @ Delicious tuning yesterday getting my car tuned after installing my innovate. He took my car out for a drive and said that he noticed back pressure due to my invidia q300 and the use of chevron gas causing him to remove about 10whp from the whole powerband(which i was really dissapointed). Now I thought back pressure was due to the sizing of the pipe (q300 = 60mm), but the people over at delicious are telling me to use a higher quality 2.5" like JDL, tomei, milltek etc and not a 3" pipe since higher velocity travel will cause low end torque to drop. Is the q300 that bad of a catback he stated that the design was terrible so I'd like some input here from some experts.

A Tomei EL header made my Innovate Kit come alive after running the factory header for 40K. And then I put the Delicious Flex Fuel kit on too.

the hell is wrong with chevron? unless youre using regular or midgrade...

twas what I said, I'm using 91 he said that it had something to do with techron lowering the actual octane of the gasoline and that 76 was nr1. Apparently arco is better as well and chevron is the worst. This is all what he said I mean he tuned my car and is pretty well known on the forums so I wanted some other input as well.

I plan on putting the Flex Fuel kit sometime soon as well. The problem is the back pressure of the catback he said the stock headers should be fine though I do plan on doing future upgrades for the full exhaust eventually.

I've got Tomei EL, Invidia: overpipe, ft pipe w high flow cat, and N1.

The exact quote I got from delicious

"The Q300 could be causing excessive back pressure for a multitude of reasons, but is most likely due to the design of the muffler/piping rather than the size of the piping itself. Reinforcing that is the fact that the OEM catback is actually slightly smaller in diameter than the Invidia and other 60mm systems, yet has no issue with backpressure waves. "

On my previous car, arco gave me CEL's saying bad cat. Chevron never gave me CELs. One CEL was a lean code cyl bank 4.

looking for more inputs on this

I'm sorry but this sounds like a complete load of bullshit

I have to agree. 10 HP for a cat back? Its just not that important of an exhaust component to maximize performancr I thought.

that's why I wanted more inputs, I didn't know that invidia was "bad" quality I could've sworn I did enough research about this and it's my first time hearing that it's bad quality followed by chevron being lower octane than the rest.

I don't have an innovated SC (cosworth), but I don't feel as though my Q300 has been any sort of hindrance to my performance. So... I question this.

I wish they would come back in and verify, I really don't wanna have to sell my q300 due to going forced induction I'd rather throw on a header and or frontpipe or something :/.

I ran my vortech setup on a Q300, switched to an N1, and then back to the Q300. Did not notice a difference, but my butt dyno has not been calibrated in some time.

so what do you guys think I should do? I don't want back pressure coming from my catback. This may sound stupid but how am I supposed to know how it feels like? Does it happen when I shift?

Also, if I ran say a 2.5" catback would I need a 2.5" frontpipe and matched overpipe as well? Does everything need to match?

If cost isnt too much, just find another catback. But you're talking roughly 3mm difference in piping. Also, I don't know if you got the Q300 for a quieter noise, but I'd get them to figure out a way to make it work.

As for everything needing to match, look at it this way: you can have just the catback. But if you're going to do the rest of your exhaust, just get headers and leave the catback. The midpipe/ overpipe don't make much difference.

Yeah I got the q300 due to noise, I had the n1 but the droning drove me insane. What do you guys think of the blitz single pipe with a delete? and some tomei el headers

I'd get a good el header and 2.5" overpipe if you haven't already .

As said above a good header makes it come alive as I found out :burnrubber:

I was told to skip on chevron and use 76 gas for a month and come back for a checkup re-tune so I guess I should change out my headers for now.

Will headers decrease performance without a tune? I am using bill's flash and go does it take those into account I wonder?

Also, what do you guys think of the blitz nur spec r single pipe? Since this is a 4 cyl boxer wouldn't that be "better" breathing? Even for FI

You'd need to get your tune to account for the headers. Otherwise it will run poorly. Also why not just run 91 or 93 octane? I don't get that. Another exhaust to consider may be the Perrin resonated.

Doesn't bill's flash and go tune account for the headers? According to bob the one who stated above us is using a tomei el header. I'm assuming he's just on a flash and go without having it accounted for? correct me if I'm wrong

It's possible, but there are so many different headers you'd want to at least want to contact them and find out. I'd say retune it just for the reassurance.

You will have to have Bill generate the proper flash and go for whatever exhaust hardware you have on the car. If you put an aftermarket header in the car that doesn't have a cat then the secondary O2 sensor will have to be disabled to prevent a CEL. Honestly IMO you are going to gain WAY more by putting a EL header and aftermarket overpipe on the car than switching your catback.

So the tomei EL is what you'd recommend? what about the overpipe / front pipe? While I'm at it should I just do the front pipe as well?

My goal is the EL / OP / FP / E85 tune hoping to keep my catback so I don't have to spend that extra money for a catback.

Yes I think the Tomei EL is very good for the cost.

The order I did the mods was N1, FP w high flow cat, OP, and Header. The N1 gave me the sound I wanted, the rest increased performance IMO.

Hey quick question for you. You drive an A/T for autox right? Do you know why the a/t jerks after installing the supercharger is that due to the "back pressure" or is that due to too crappy of a torque converter and or a need of fluid change?

Who's your tuner? Is it jerkiness when you try to accelerate at low rpms?

yes it is very jerky accelerating / shifting at low rpms and it's bill from delicious.

I'm using delicious too and I'm manual transmission. I don't think it's the AT. There's a few people having this problem, I haven't taken a log for bill yet, he's asking me for one. You should send him a log too if you can. It seems to happen in the 1500 to 3000 rpm range for me.

I'm not saying it's a delicious tuning issue because I know someone that's having the issue with a moto east tune as well. It might have to do with the S/C itself.

I'm going to be going to him for another retune anyways I don't actually have the dongle XD

When you going? Keep us posted please in the Delicious tuning thread

When I throw on my headers / fp / op. It shouldn't be a problem driving with those without a retune right?

You might get a CEL but otherwise no

I mean CEL is just a check engine light shouldn't be a problem right just won't know what goes on if anything does happen.

No it won't be a problem

Already having the flash and go tune, if I got the e85 kit, headers, op, fp you think he'd have to do a custom flash or would he just have to add some adjustments. In a nutshell, you think I'd have to pay for a whole retune or would it just be an update for a small service fee or something.

If he has to make adjustments it's like $65. You won't have to pay for a whole tune

I don't have that problem on my car. I mostly drive it in sport mode on the street and manual mode when autoxing.

So I got my JDL installed full exhaust + a perrin cbe. I didn't get the car retuned yet but I noticed I lost a giant amount of low end torque. Provided I'm not gonna go hard on the car until I get it retuned but is the huge loss in low end torque normal before retune?

AFR of 14.3-14.6 is good as well correct?