Thread: Another pull-through vs blow through

have you actually had a wideband on the car and have a good tune then put it to blow thru and have a ****y tune ? i have and im sure others have to

edit look at the dyno graph it is obvious it will need a different tune the afr is in the 10s on the blow thru and 12s on pull thru

lets get people to post up their results... this was my experience...

coheed, i have had to retune my car when doin blow thru, and im sure if everyone had a wideband they would know they had to retune there car to, this is a simple tuning thing

Cliff Notes for anyone reading this thread:

They took a maf and dynoed it draw through. Then took the same maf and moved it to a draw through setup and didnt change the tune but they are saying that draw through makes more power.

Has anyone here actually driven there car at 10.0:1 Air fuels and then tuned it for the 12.0:1 its supposed to be at?? I have and its a big difference lol. Cmon guys this is rediculous

exactly it has nothing to do with placement of the mafs it has to do with the tune

I had a JWT setup, cobra maf, 50lb, very basic. I went from draw through to blow through. only difference was 3" piping from maf to TB and I gained 18whp. I had the dyno charts on my website that went debunk, but I may be able to find them. I did nothing. So, I gotta think there is something faulty in your blow through setup. Maf placement or something causing bad readings from the maf.

Brent

Brent, did you do that with your Air to Water setup? If so where did you put the maf? The pics Ive seen of your setup, you have like 5 inches of total piping. I thought it was best to have the MAF further away from the TB. The rest is turbo and intercooler right off the sidewinder. Or did you ditch that setup?

El oh el. I went from draw thru to blow thru last year and I noticed no difference, and I DID NOT HAVE TO TUNE ANYTHING. It fixed some other issues I was having, but I don't know if there was any difference in power though.

You shouldn't have to retune anything when changing from one to the other. Sure, more power could be made if it were leaned back out, but at what compromise? If you adjusted the fuel pressure to lean the mixture out then the car would prob not want to run at all at idle. how many people have had to retune for this kind of setup? Are you guys just not happy with the results?

I'm feeling a lot of hate in this room because people just aren't happy with the results we got.

Maf placement on his setup was exactly where I have mine right now. He drove the car to the dyno with the blow thru setup. I really would like to see someone else post results and their setup.

I can't believe how many of you are saying "you need to tune it" when there is noone here using any sort of engine management other than a computer flash... Wow, that makes a lot of sense. If it made that kind of difference, then everyone would have Bin files out for blow thru.

JWT tunes all their computers using a pull-thru setup, they recommend against blow thru.

How exactly are you "tuning" your car? What maf are you running? Obviously not the stock maf... I thought you were running a calum also?

On my z32 maf I was running slightly richer on the pull thru setup, prob because of a slight boost leak somewhere, but all the piping holds 35psi just fine for over 5 min. Running blow thru on my car bumped up my AFR by almost half a point.

...?