2G Hesitation upon WOT

[KeelesKustome]

98 gsx, Automatic 6 bolt, bse, MM oil filter, 6 bolt big rods, 2g pistons, 1g IM magnus HBG, Injen Intake stock maf and K$N large air filter, 3000gt 60mm TB, Apexi N1 31/2" Exhaust, NGK Plug Wires, 2g coilpack, rre rewire, pte 880 FI, 195 FP, 20g buschur P&C turbo with mhi housing, SBR ported exhaust manifold, street gate external wastegate with , kiggly A/T adapter for 2g , ets FMIC, ssq hks bov, hallman mbc, roadsurge DIY paddle shifter . Trans temp gauge & cooler, Arp head studs, cometic HG, dsmlink




I have been running my setup at 21 psi with no issues,

I now am having hesitation issues once the boost has been tuned for 32 psi.

My car being auto i first thought tranny slippage, thats not it.

As first gear will only hit 26 psi with a weird hesitation and it doesn't really wana rev past 6,000 rpms with this boost level, 2nd gear will jump up to 32 psi at 4200 rpm's, then it'll begin to hesitate at 5,000- on.
My previous shift points were around 7,500 rpm's.

I've never felt what fuel cut feels like, but this does seem to be whats happening.
If I had a wideband I wouldn't have needed to get advice, I know, it's on my list of things to buy.
But am I feeling fuel cut?

If so should i be looking at a FPR or a bigger FP or bigger injectors also?

 

[DSMTyson]

You need larger injectors and a bigger fuel pump. You are probably running into the limit of your fuel pump and maxing out your injectors..

 

[SHEARER_TSI]

I don't think you need bigger injectors but a afpr for sure and bigger pump. What are the duty cycles for the injectors?

 

[KeelesKustome]

^^
Will the 250 walbro rewired be big enough?

What regulator is ideal for cost and function?

I plan on getting some 272 cams in the next year, at that point would i need to consider bigger injectors? or just up the fuel pressure to 55 psi?

 

[SHEARER_TSI]

well what are your goals, what fuel are you using? Are you on the stock rail? If so you can call buschur and see if they still offer their AFPR which is a SX regulator modded to fit the stock rail or look for a used one. The fuel lab regulators are good and pretty cost effective, but then you have to run lines etc, which can add up rather quickly. If I were running the stock rail I would try and find one of the buschur afprs, I had one and it was great when I was on the stock rail. SX makes one of the best regulators in my opinion, that or a weldon. It was a toss up between the two when I bought my new regulator, I went with SX because I found one in stock; but both are amazing regulators.

 

[KeelesKustome]

93 octane , i plan on just getting enough fuel to flow my current turbo, setup, with 272 cams and call it a day.

 

[SHEARER_TSI]

Those injectors are plenty. If you were running ethenol then I would say go bigger. The walbro 255 should be plenty as well. I think you will be amazed at what a difference a fuel pressure regulator will make.

Sent from my DROIDX using Tapatalk

 

[KeelesKustome]

A member on here may be selling me his AEM setup with the lines to hook it up, it appears to be their universal one that extreme psi sells for $119 without the gauge or lines.
Thanks for the advice, this is new to me, I never thought I'd run out of fuel but, it doesn't suprise me.

 

[SHEARER_TSI]

You might just be over running the stock regulator

Sent from my DROIDX using Tapatalk

 

[dnhieu]

you have alot of stuff going on all at once. personally i think you definetly need a afpr, and wideband. i also think your pushing the limits of pump gas. have you ran a log through dsmlink yet????

 

[KeelesKustome]

yes. DSMLINK shows minimal knock.
I don't trust dsmlink on A/F ratios. I know i need a wideband,

First i need fuel, I can still keep an eye on knock.

If you were in my position, would you purchase a bigger fuel pump, or FPR first?

I don't have the funds for both right now.

 

[SHEARER_TSI]

If it were me....afpr

Sent from my DROIDX using Tapatalk

 

[KeelesKustome]

done, thanks.

 

[SHEARER_TSI]

What regulator did you get?

Sent from my DROIDX using Tapatalk

 

[KeelesKustome]

Well i haven't yet, I'm about to pay for this $95 with all the lines if you think it's a good deal. I'm unsure it's brand though, so I'm hesitant.

You must be logged in to view this image or video.

 

[SHEARER_TSI]

Looks like an aeromotive but I would find out. You don't want some chinese piece of junk.

Sent from my DROIDX using Tapatalk

 

[KeelesKustome]

Okay it's paid for and on the way.

My pte 880cc injectors, I was told they are only at 880cc when they have 50 psi FP.

Is this the max amount of pressure I should push these? or would 55 psi be a suitable range?
Or am I all wrong?
When i set it to 43 psi stock, with 30 psi boost it should go up on it's own to 73 psi correct?

 

[KeelesKustome]

The regulator is hovering around 37 psi at idle. when i remove the vacume source and plug it, the pressure is 43 psi.

Is this the correct way in making the pressure where it should be?