Safe boost level slave engine
#1
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Safe boost level slave engine
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
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
#2
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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!!
and there is only one way to find out!!
#3
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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
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
#6
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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
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
#7
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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
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
Last edited by OldManZ350; 11-14-2014 at 12:11 AM.
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#8
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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
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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
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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.
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.
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