vtekthis

3 psi diff huh? at 280 kpa id be more worried about being 8 psi above map honestly...

Joe, are u using 2 T1 dampers on each signal? you said duel damper kitm im curious how u have it set up o be unbiased

ahobbs

i understand what your saying, but there is still a difference, when technically it should be the same. if you have two gates both at 9psi springs, why is there a diff from one side to the other?

the 8psi back pressure diff is still pretty close. to 1:1. not too far off

tony1

My car had over 10psi difference at one point...

vtekthis

saying that a 3 psi split is not acceptable is NOT ok, but 8 psi above map is close enough.....that **** is funny.

Tony- yes you did at one time until u found out how bad it was lol why not show ur most recent I2 data lol

tony1

I mean 10psi difference in emap1 and emap2. The point of this conversation.

vtekthis

no fun T1

on a actual note, with the 3 psi split, what was the backpressure in realation to map?

FunctionovaForm

have you guys tried bridging the actual runners to the gates in stead of the turbo? I think that might help equalize the pressure between the gates?

matt k

Are u guys testing to make sure all the sensors read the same I would see a few psi swing from different sensors the 5 bar and the 0/100 psi sensors never matched and evan the same manufactures sensors would be off a little bit a wrote a math channel in the aem and used shop air to get them all withen a half a psi of each other still had problems getting the twin gates to match whent to a big single problem solved

tony1

It's not a sensor cal issue, the problem gets worse as EMAP increases because the gates are closing. Equalizing pressure solved the problem, which wouldn't be the case if it was a sensor cal issue.

locash

Vtekthis, sorry, I had the math scalar set up wrong for the map, lol. I had a -14.7 in the offset for the map display, whoops! See what happens when you go changing it from kpa to show it?

Manifold pressure was actually 5-6 psi higher than emap..

vtekthis

so u scaled the map but not the emaps? i had to train myself KPA just to play with the Motec, or else i just confusd myself over and over again lol

tony1

Joe, i'll send you some info on how to make math channels to have PSI versions to pull up with having to offset them for atmosphere.

locash

Yep, lol. Just switched laptops and didnt have my normal layout settings.. I almost need a cheat sheet taped to the side of the laptop for kpa-psi and C to F, lol.

ahobbs

Nothing wrong with a cheat sheet until your familiar.

Hurrikain

Was that because of volute or runner differences?

matt k

Still not a bad idea to check all the sensors from a single source to give u a base line

tony1

Very possible and something I considered as well, but seeing how much a very small percentage of wastegate opening can make on things I think it's more likely to be a gate issue.

In any sense, even if everything is perfect, it's only like that till a gate starts acting up.

locash

Sweet, better than the help file that says "No further help on this item." lol

Enzo-Racing

I never had matching emap's with twin gates...

I run single 60mm now..

nonvtecallmotor

And whats the ET or MPH again?

Enzo-Racing

I don't run a honda...

new setup should be ready sometime next year...

thought this topic was about backpressure not ET's or MPH...

Blown90hatcH

Thanks guys for all the technical discussion on this topic. For those of you contemplating or have already done so, gone to a single gate, are you still running a divided collector? I am possibly looking at building a new manifold and am stuck on the decision of a single gate and divided vs. non-divided collector. This will be for a divided turbo.

nonvtecallmotor

I know what you have. I wanted to know if you had results.
IMO what does any of it matter? If it doesnt have result in ether MPH, ET, control, or reliability. I have never checked BP and wanted to know if its relevent. Yes theres a difference in the gates. I want to know if theres is gains of any kind by equalizing them.

SLIM NOTHING

X2

locash

Since backpressure is directly related to efficiency, how couldn't it make a difference?