selp

iTrader: (6)

Weather was 100+F (Arizona).
This is an 2.3L Evo IX , Fully ported EF4 Turbo, 9:1 Compression, ported head, GSC S2 cams, ported IM, 70mm TB, Nisei Intercooler, spooling up cop. Stock MAF in place (no SD).
450LPH Walbro pump was starting to fail, it will run fine at idle, but at full boost it will go very lean. This was at 30psi boost because boost controller couldnt give more (already ordered a heavy duty spring), and pump going lean.


I was hoping for better spool and higher torque, do you guys have any ideas on what else I could do to better the spool? I know there is no boost graph, but with the torque curve you can get a very good idea. Once I get the boost controller I am hoping to take it to 35psi. I also have a 65 Ported TB that I am thinking of installing to maybe help the TQ Curve and possibly the spool.

Any ideas, recommendations?

Thanks

slowsrt4:(

iTrader: (13)

EF4 beast!

selp

iTrader: (6)

Thanks!
I still need to take it to 35 PSI, and fix the fuel pump issue.
I am hoping to be able to increase the spike sooner using a stiffer spring on the boost controller, get a higher torque spike, and be making 560-580whp and 530wtq.
Then ill be happy.

94AWDcoupe

iTrader: (125)

torque curve looks normal to me for ef4. it doesnt tq up fast at all. its made to push 700+

04slowevo

iTrader: (17)

Is your Walbro 450 rewired?

e_kobz

iTrader: (36)

Would you consider switching to speed density?

04slowevo

iTrader: (17)

Speed density is great. I just had a friend tom stout post my numbers with my 2.4L EF4 numbers above just now.

selp

iTrader: (6)

I am now thinking of going to speed density. I like to drive to the mountains and take the car to the snow, so I see extreme temperatures (from arizona to colorado), and I am concerned with driveability in general.
I am not sure I will gain a lot going from MAF to SD. What can you guys that transitioned from MAF to SD have to say? before and after power? etc?

e_kobz

iTrader: (36)

You're should notice a bump in power. The only thing i'll say is elevation changes can be a nightmare when it comes to speed density.

krisdlm

iTrader: (17)

can you comment further on this? I am also leaning towards SD but I just want to be confident before making the decision. Seems like Tom TSComp has had nothing but rave reviews which seems promising, but I also would like to get more input

tscompusa

iTrader: (31)

There are no issues with elevation and speed density when its tuned properly for it. None of my tunes have issues with elevation even driven up 6000ft+ and back to sea level.

selp

iTrader: (6)

so.. after installing the double pumper and turning up the boost. Turbo doesnt seem to want to boost higher than 28-30 psi.
https://www.evolutionm.net/forums/ev...l#post11356195

Ive tried everything. Any help would be greatly appreciated.

Regards

e_kobz

iTrader: (36)

What DV are you running?

selp

iTrader: (6)

Stock BOV (IX MR).
I Installed another one at the time of the tune, didnt make a difference.
I hear stock bov's are good and hold 40psi.

e_kobz

iTrader: (36)

My stock IX bov leaked around 26psi. I would spike to 30psi then fall to 25 by 7500rpm. I replaced my stock IX bov for a Cobb adjustable DV that I bought a member on here. I installed it how he ran it, so not much preload. I took the car out and did a pull and I spiked to 34psi. Now I don't recommend doing this but I'm just letting you know that my stock bov was leaking pretty bad and the Cobb DV made a huge difference