Hi
Currently I blow 17psi on 98oct and I have 610hp is this safe to go with 21 psi on 100oct? My aim is ~700hp. Engine vq is slaved, pistons compresion 8:5.1, greddy tt 18g any experience with high boost? Unfortunatley I dont have external map sensor only base in haltech platinium

 

what work have you done on your heads? what other supporting modification do you have? will you email me your base map?

and there is only one way to find out!!

 

I put revup camshafts 258 and additionally
Supertech Viton Valve Stem Seal Kit, Nissan VG, VQ, RB, VR, SR
JWT Heavy Duty Valve Springs & Shim Kit 03-06 G35 Sedan, 03-07 G35 Coupe, 03-06 350Z VQ35DE
Full list of modification is in my garage
If you want I can send you my map but you know that this is not plug&play probably you have other fuel indjectors and fuel return

 

should be no issue if the car is mechanically sound

 

Tomorrow we will check I hope engine survive 22 psi

 

No ****ing way to do more than 640whp we try several houers and nothing below list of my modifications what is missing?
For sure I will have to put new sparks 7 are to weak maybe 9 would handle and crankshafts 272
Modification list
CP Forged Pistons Nissa-CP Forged Pistons Nissan VQ35DE 350Z G35 Z33 95.5mm 8.5:1
Brian Crower H Beam Rod-Brian Crower H Beam Rods 350Z G35 VQ35DE 3.5L 5.675
ACL Main Bearings (STD) - VQ35
ACL Rod Bearings (STD) - VQ35
ACL Thrust Washers - VQ35 Z33
ARP VQ35 Head & Main Stud Kit
Supertech Viton Valve Stem Seal Kit, Nissan VG, VQ, RB, VR, SR
JWT Heavy Duty Valve Springs & Shim Kit 03-06 G35 Sedan, 03-07 G35 Coupe, 03-06 350Z VQ35DE
Fuel return cosworth and 850 FIC, external bosch fuel pump and swirlpot
Tomei fuel pressure regulator
Greddy tt kit with intercooler
Greddy catch tank
Haltech platinium with harness
High capacity radiator
High capacity oil radiator
Revup camshafts 258
K&N air filtres
Carbon air ducts
Haltech Boost controler
Internal map sensor up to 21psi
Transmision cd0009
Short shifter
SPEC SS-TRIM SUPER TWIN DISC CLUTCH

 

Hp starts falling off quick at less than 6200 rpm.

Don't know what's going on, but with the 272 cams it should pull well beyond 7000rpm. and maybe past 7500rpm

Could be running out of Fuel? Or out of Turbos?

Got a Boost Curve for those runs?

TimRod

 

Fuel is not a problem we have significant reserve. When we started increase boost I notice two main issues. First was misfiring, probably related with sparks or coils. This I can fix by swapping “9” instead “7” or increasing coils timings in Haltech. Unfortunately the car didn’t want to make hp on higher boost maybe this is matter of temperature or turbo’s. maybe good idea would be installing methanol injection? Anybody had similar problems with higher boost? What can be other reasons? Unfortunately I don’t have the boost curve but boost is growing across the curve so the biggest should be on the end

 

Plug gap needs to be about .032", that could be an Issue.

If you think you need Met, Why? Retarded the timing more, or better yet, just put in some VP C16 that Octane was a problem.

So are you saying HP fell off at 6200rpm because of Spark Misfire?

 

I don’t know if the reason was spark misfire but I notice that when I increase boost car started losing spark on at least one cylinder and worked unevenly. I thought that was coils fault but maybe this is matter of spark gaps I got #7 with 0.02 gaps maybe I should install #9?? In intake temperature is on the level of 89F that’s why I thought about methanol injection

 

ATI's are 89*f?

Is this under Boost?

And what was Ambiant?

 

Yes 89F is under boost Ambiant was 70F

 

Maybe 17 psi is a max limit for greddy TD05 18g

 

That's pretty good!

 

I doubt it's the turbo. The MHI 18g can move about 400whp worth of air per compressor when paired with an 05h turbine in a 7cm² housing, I believe the Greddy TT kit uses 8cm² housings which should push that a little higher.

Definitely keep an eye out for surge at higher boost on that compressor though- it has the same dip in the surge line as the 20g above ~18psi. It's not as bad as the 20g (it has a smaller rotor ratio), but the potential is there, especially above 20psi. It will be worse at high altitude.

 

You need race gas/or methanol, good cams, (you have the fuel) and a good tuner to get you 700whp on the Greddy 18G's.

Its possible.