High compression/cammed VQ35- Spec V swap..
11-19-2008, 11:26 PM
#1
High compression/cammed VQ35- Spec V swap..
I'm currently putting together a setup for a Spec V swap.. consisting of..
VQ35DE block
VQ35DE ported heads
VQ35HR pistons (fly cut to clear heads, and yields 11.5:1 C/R)
JWT C8 camshafts (272*/12mm lift.. 235* @ .050")
2002 Altima ECU/harness with CVTC/VIAS
Technosquare reflash for current mods and 7500rpm rev limiter
VQ35HR oil pump
Stock FWD aluminum manifold (for now)
Catman headers/y-pipe (modified for Spec V swap)
2.5" exhaust
QTP electronic cutout
3" Intake with POP charger
JWT clutch/flywheel (6spd trans)
The heads have been cleaned up, with most of the work going into the short side radius, to improve the transition coming into the chamber.. as well as some moderate bowl work, and slight port enlargement/reshaping. Nothing crazy, but, I expect modest gains.
Anyone want to take a guess at what kind of power we're going to make?
Travis
VQ35DE block
VQ35DE ported heads
VQ35HR pistons (fly cut to clear heads, and yields 11.5:1 C/R)
JWT C8 camshafts (272*/12mm lift.. 235* @ .050")
2002 Altima ECU/harness with CVTC/VIAS
Technosquare reflash for current mods and 7500rpm rev limiter
VQ35HR oil pump
Stock FWD aluminum manifold (for now)
Catman headers/y-pipe (modified for Spec V swap)
2.5" exhaust
QTP electronic cutout
3" Intake with POP charger
JWT clutch/flywheel (6spd trans)
The heads have been cleaned up, with most of the work going into the short side radius, to improve the transition coming into the chamber.. as well as some moderate bowl work, and slight port enlargement/reshaping. Nothing crazy, but, I expect modest gains.
Anyone want to take a guess at what kind of power we're going to make?
Travis
11-20-2008, 06:28 AM
#3
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I'd guess about 290-315 whp at this point... I think you'd see alot of gains changing out the 2.5" exhaust for a 3" and SSIMing that FWD IM. Similar mods on a 350z (with a true dual and revup IM) made 320 whp.
11-20-2008, 07:52 AM
#5
I'm going to say 290-ish. Only because of the stock IM and unmodified cam timing maps (unless you got TS to change it for you). Sounds pretty good so far. Which valve springs will you be using?
11-20-2008, 08:18 AM
#7
Yea, I'd like to know about the springs. I'm assuming HR/JWT double shimmed? I'm getting the HR double shimmed in my car now, and dont plan on reving past 7200.
11-20-2008, 09:12 AM
#9
Hell, they're a blast to drive at 235whp, with just bolt-on's.. 
This one is going to be nutty..
I'm using JWT's single spring.. Not sure of the seat pressure, but, it has a larger shim than stock, and Clark informed me that it would be good for 7500rpm with the C8 cams.
I think it'll be around 285whp, due to the stock manifold.. In about 2 months, we're going to be adding a sheetmetal manifold with velocity stacks, and a direct port setup..
Travis
This one is going to be nutty..I'm using JWT's single spring.. Not sure of the seat pressure, but, it has a larger shim than stock, and Clark informed me that it would be good for 7500rpm with the C8 cams.
I think it'll be around 285whp, due to the stock manifold.. In about 2 months, we're going to be adding a sheetmetal manifold with velocity stacks, and a direct port setup..
Travis
11-20-2008, 09:30 AM
#10
No v-manage? 
Or I guess TS could do it for you as well.
rednezz on my350z saw some significant gains up top with his tomei 272's by delaying the point at which the intake cams fully retard. The stock map retards them too soon when using long duration cams and dynamic compression is lost even at or slightly beyond the stock fuel cut. Dialing in some advance at higher revs can actually be beneficial in restoring it. Of course, as you know comparing two different sets of cams is an apples and oranges affair, but I still think tweaking the cam timing would be of benefit.
Also, YGPM.
Or I guess TS could do it for you as well.rednezz on my350z saw some significant gains up top with his tomei 272's by delaying the point at which the intake cams fully retard. The stock map retards them too soon when using long duration cams and dynamic compression is lost even at or slightly beyond the stock fuel cut. Dialing in some advance at higher revs can actually be beneficial in restoring it. Of course, as you know comparing two different sets of cams is an apples and oranges affair, but I still think tweaking the cam timing would be of benefit.
Also, YGPM.
Last edited by nismology; 11-20-2008 at 09:51 AM.
11-21-2008, 07:57 AM
#13
Yea I glanced over briefly and figured he may be talking about the Revup. I just did another build using the revup, it'd be a shame if the HR bolts in and is more beneficial. Then again im only reving to ~7500.
11-21-2008, 09:36 PM
#18
w00t!!!
I actually would like to see more info on this sheet metal IM with velocity stacks you speak of! If it proves gains over SSIM without too much loss at the bottom, I'd be all over it!
I actually would like to see more info on this sheet metal IM with velocity stacks you speak of! If it proves gains over SSIM without too much loss at the bottom, I'd be all over it!
11-22-2008, 01:16 AM
#19
I thought I had better pics of the cylinder heads all cleaned up, after the port work.. but, this is the best that I can find..
Also, the C8 cams came in yesterday..
The engine is 100% finished, and ready to go in.. I should have it running this weekend.. Stay tuned for video and dyno numbers/track times.
Travis
Also, the C8 cams came in yesterday..
The engine is 100% finished, and ready to go in.. I should have it running this weekend.. Stay tuned for video and dyno numbers/track times.
Travis
11-22-2008, 07:00 PM
#23
Travis
11-24-2008, 12:58 AM
#27
Well.. she's alive..
I've got about 100 miles on the clock, so far, and I dropped the break-in oil.. so, we're good to go.
My impression...
The C8 cams with JWT's shelf-stock springs.. perfect for power all the way out to 8K rpm. This car pulls HARD from 5K to the rev limiter of 8K.. Not much bottom end loss.. Noticeable, but, not dramatic. The idle is noticeable, but, not dramatic, and there's no stalling issues or anything funny that I've noticed so far.
I got in a quick race with my buddy this evening.. He has a '01 Lightning that runs consistent 12.50's @ 108-109mph. From a 10mph roll (1st gear), on street tires.. (Lightning is on Nitto drag radials), I spun 1st/2nd, but, kept him within 1 car's distance from me. From 3rd gear on up, I was ever so slowly pulling on him.. and by 110mph, my front bumper was even with his door. We shut it down and drove home.. I think the car will go 12.30's-12.40's on the 24.5x8" slicks, as it sits right now.. We'll find out Wednesday..
I'll have video up soon..
Travis
I've got about 100 miles on the clock, so far, and I dropped the break-in oil.. so, we're good to go.
My impression...
The C8 cams with JWT's shelf-stock springs.. perfect for power all the way out to 8K rpm. This car pulls HARD from 5K to the rev limiter of 8K.. Not much bottom end loss.. Noticeable, but, not dramatic. The idle is noticeable, but, not dramatic, and there's no stalling issues or anything funny that I've noticed so far.
I got in a quick race with my buddy this evening.. He has a '01 Lightning that runs consistent 12.50's @ 108-109mph. From a 10mph roll (1st gear), on street tires.. (Lightning is on Nitto drag radials), I spun 1st/2nd, but, kept him within 1 car's distance from me. From 3rd gear on up, I was ever so slowly pulling on him.. and by 110mph, my front bumper was even with his door. We shut it down and drove home.. I think the car will go 12.30's-12.40's on the 24.5x8" slicks, as it sits right now.. We'll find out Wednesday..
I'll have video up soon..
Travis
11-24-2008, 01:25 PM
#32
11-24-2008, 06:13 PM
#34
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This may be a noobish question but where does it sit at idle, stockish or closer to 900 or so?
Congrats on excellent work! Makes me want to go out to the garage and work on my Nissan...after I get a better heater
Jeremy
Congrats on excellent work! Makes me want to go out to the garage and work on my Nissan...after I get a better heater
Jeremy
11-24-2008, 06:49 PM
#35
Here's a few highway pulls from earlier.. And, to top it off, this was with a dead/shorted knock sensor!
http://www.fi-r.net/images2/VQSwapFi...ghwayPulls.wmv
I pulled a knock sensor code when I got to Nissan after that video was shot..
Travis
11-24-2008, 08:26 PM
#40
Heh.. thanks.. My fav. band.
Here's a few highway pulls from earlier.. And, to top it off, this was with a dead/shorted knock sensor!
http://www.fi-r.net/images2/VQSwapFi...ghwayPulls.wmv
I pulled a knock sensor code when I got to Nissan after that video was shot..
Travis
Here's a few highway pulls from earlier.. And, to top it off, this was with a dead/shorted knock sensor!
http://www.fi-r.net/images2/VQSwapFi...ghwayPulls.wmv
I pulled a knock sensor code when I got to Nissan after that video was shot..
Travis
Man that thing looks like fun