Thread: Another pull-through vs blow through

Obviously if you look at the graph you can see the car runs richer on blow thru. WOW, someone can read the chart. Maybe that's why the pull thru made more power

This isn't a thread about the tune, I know a lot of you guys like your blow thru setup. I like mine. But I would like to see the data in front of me proving that it is better. I've read every blow thru thread on this forum and the old one, never have I heard of anyone having to retune the car afterwords. Get real.

My point is, that something was making the maf read funny. That's why it didn't run as well. That's why the pull thru made more power. But it isn't the tune. The maf just didn't like the blow thru setup.

If you guys doubt the results, then post your own. If you can't back up your talk with actual data, then don't be hating on dallon for his results. Like I said before, take these results with a grain of salt. Dyno for yourself and see if you make any diff in your power. But I guarantee that all of you that say you need to tune are not running a tuneable ECU in the first place.

Ah, the cobra maf. Your charts would be interesting to see if you still have them. There is nothing faulty in his blow thru setup, his maf is in the same place I have mine. We had everything set up to make it as easy and quick as possible to do the swap on the dyno, but there was nothing wrong with maf placement. It had a straight shot to the TB and was 12" away.

I listed my blow-through setup earlier in the post, but my maf location was exactly where the hotshot intake went to the cold air extension. Heck, i even used part of the hotshot intake as my intercooler piping. Wideband showed a tune of 11.5:1 at WOT on a calum basic. Car ran really hard not having a boost controller hooked up. No dyno charts, but I know for a fact it takes atleast 200whp to walk a camaro ss.

OK im confused. Is this thread a joke or something or are you serious here Coheed?

YOU started this thread saying that a draw through setup would make more power then a blow through. "By how much??? you wont believe it when you see it." Uh yeah you were right. You posted up a dyno of a setup running 10.0:1 a/f's and one with the a/f's around 12.0:1 . I couldve given you the same results leaving the maf in the same spot and just changing the A/F ratios on my car. Your point when you started this thread seemed to be to show that the draw through setup makes more power....

Now your point has changed to: something was making the maf read funny. OK??? What does that have to do with anything though? Im confused here. Nobodys doubting the results lol we knew a 10.0:1 a/f would make less power then a 12.0:1af with the same setup. Were all just confused as to what the hell it is that you are trying to get at here. Hell I know i am. Seriously what are you trying to say?

What does the maf not reading right with blow through have to do with anything?? Did you test the car for boost leaks after going blow through?? Seriously, your "experiment" is flawed in so many ways that you could never get a credible result.

And i am running a "Tuneable ECU". I have a wideband in my car and an SAFC2 on the ECU...I chang the tune on my car on the fly almost daily. From on the highway where I lean it out more for better gas mileage, to WOT runs where colder or warmer weather slightly changes the cars tune. So what are we getting at there?

I just seriously sitting here confused as hell as to what you were actually trying to accomplish or get at with this thread... I mean All due respect, But from reading your post you seem like your very good at throwing parts on a car. But when it comes to actually tuning the cars and setting them up to make the numbers they should you seem to fall short. It seems as if your learning as you go. But why come on here and act like your showing us something new when really the way you came upon the results is flawed in the first place. I mean seriously If your test came up with results that showed draw through did indeed make more power then blow through and the experiment you did was controlled and done the propper way Id be the first one switching my **** up. But thats not what we have here. Im still lost and trying to understand why you even posted this. Do you not see all the flaws in your methods?? There is no hate in this thread. Just confused people.

Guys. The point is mute from the beginning. Hear me out.

I've noticed on my blow-thru setup that my MAF hits 5v around 5k rpm. And therefore runs ridiculously rich all the time, except under cruise and 3.5k rpm.

My turbo is dying as well (oil seeping on intake side, smoke after long periods of idling after hard runs). I can shift the point it hits 5v by a pretty decent amount just BY CLEANING THE MAF SENSOR.

Oil in the intake seems to have a huge factory in the accurancy of the air reading by the MAF sensor. I'm sick of it. I'm considering selling the car or repairing this Megasquirt box I acquired and installing that.

i am running a calum ecu with z32 mafs, what you mean by puttin blow thru it bumped it up ? like made it more lean or rich ? i know for a fact when i switch to blow thru it was acting up so i backed off the fuel pressure a little bit till i got where i needed it, i figured the computer would fix the lean condition while cruising witch it did

one thing guys is that i have seen in person a 240 with a redtop sr and a 60trim being tuned on a blow thru setup with z32 mafs and the biggest problem was they couldnt get it lean out after 7000rpm still making 400whp they thought the problem was the blow thru setup and said it was the first time they had tuned a car setup like this and i am also having this problem with my car

I am sure everyone wanted to see results of a properly setup blow thru vs pull thru setup. It's not rocket science. I am not a master tuner, but I learn from the best, and I'm still learning. This is about as basic as it gets. If you put a 3" exhaust on your car and got the same results, would people complain because you didn't retune the car afterwords?

Trust me I wouldn't steer anyone wrong here, I know exactly what is going on with the maf. The point of the thread is to get people to THINK about what is going on when they change the setup around. Those who are confused fail to think about it, therefore, don't understand it.

What exactly is the "proper" way of going blow thru. I have gone blow thru on tons of different cars, and not had a single issue. But none of those cars had a maf with an opening the size of a quarter.

But seriously, can you come to any other conclusion? The AFRs changed and the car lost power on blow thru. IF you could get the car back in the area of 12:1 then we would have made more power, sure. But it would have negated any results we got because of the variable of tuning.

*cough*

This thread is pretty stupid and worthless. The same amount of air is passing through the MAF regardless of if it is being pulled through before the turbo or the air pushed through after. If for some strange reason switching from draw through to blow through makes your car run rich re tune. The hp should be around the same if nothing else changes besides the MAF position considering it reads the same mass of air traveling through it no matter what the position.

ok guys. you keep saying that on different cars it has a different effect. thats of course a given. always, even the slightest thing can make the difference. on my budget car, the g20de-t i dont have a fuel pressure regulator, or a tuneable ecu. i just have a calum basic with the det setup program. t25 turbo, 370's. ... blah blah blah. the charts show that my car made better, and more reliable, AND better economy with a pull through setup. i am running a de maf. and 2.5" piping. all that this thread is for is to find out, according to location, design, and parts, what will help all our cars be better. we are all in this together to make more power, so lets all go dyno up, and post up our results, and find the most offen occuring. its not that hard to switch around... personally i was thinking hard about the flow of air through my MAF and i think its because i have 2.5" piping going into a 3" MAF (then back out at 3.5) so insead of argueing about it, lets all go TRY it, and see if we can make more power!!! tune it, do whatever you need to. WHAT MAKES MORE POWER IS THE IDEA BEHIND THIS THREAD.