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How Much Of A Difference Higher Lift Makes ? + Camshaft Duration

cobrAA

By cobrAA,
in Engines & Forced Induction

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Joshbigt62r Proficient

Joshbigt62r

Posted
Posted

Thought about a gearbox yet?

That will be next on the "to do" list.

what box are you going with paul? Have you made a decision yet? As for those 262 dur. 11.3mm lift. Cams thats some crazy lift and would be quite interested to see some results.

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SimonR32
SimonR32

Ok so a bit of an update. I went to 250 Type-R poncams, lost top end (probably 20-30hp at 700hp) and matched bottom end but the old head did have the intake squish removed so it's not a direct compari

SimonR32
SimonR32

So interesting result so far, went for a drive with the Type-B's (260) today, getting boost 300rpm earlier in 4th gear to the Type-R (250). Was 3900rpm in 4th to get 1.0bar and now it's 3600rpm with t

GTR_JOEY
GTR_JOEY

LS1 transplant? Haha

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Mick_o Grand Master

Mick_o

Posted
Posted

what box are you going with paul? Have you made a decision yet? As for those 262 dur. 11.3mm lift. Cams thats some crazy lift and would be quite interested to see some results.

OS88 sequential box mate ;)
cobrAA Mentor

cobrAA

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They're an Alfa Romeo NA lobe which uses a 32 mm base circle (stock lifters). Camtech grind them up.

I'll get the specs one day and post them up. But what we wanted was short duration and biggish lift with an agro ramp rate. HKS step 2 springs wernt enough to keep the bucket on the lobe with anything more than 19 psi and 5700 rpm iirc.

After spinning up a JUN 264 at 10.5 and Tomei 270 at 10.25, Yavuz located this lobe and used it.

There is another set. 262 at 11.3 iirc, once again with an agro rate.

I'll get the finer details next time I'm out there (if he is ok with making the info public).

I asked them camshaft spec card and they never replied to my request so I lost interest in unigroup's cam.

cobrAA Mentor

cobrAA

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Thought about a gearbox yet?

That will be next on the "to do" list.

open, rebuilt, cryo-treat the stuff and seal it back. I thought about a gearset, but they are too expensive for something that could brake just as quickly as the oem thing. ANyways we're drifint away from the interesting subject we had before!

cobrAA Mentor

cobrAA

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Piss the standard ignitor off (it's an electrical bottle neck), new coil pack loom and new coils. Guys reinvent the wheel for no need with this shit.

i have 10k new oem coil, with 10k new loom and new HPI6 ( haltech) ignitor.. still if the ls2 offer better spark than i guess it could make a difference.. Anyways, let's stay on track guys! :)

Joshbigt62r Proficient

Joshbigt62r

Posted
Posted

People make 500kw+ all day every day with splitfires or oem nissan coilpacks. Why waste money on ls2 coils? Better off spending that coin else where. Like ths quaffie frond lsd rather than the nismo you mentioned earlier if I remember correctly.

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Nismo 3.2ish Grand Master

Nismo 3.2ish

Posted
Posted

They're busy a lot of the time

Haha, your such a nice bloke Joey, these blokes do not give a F , and they seem to be all the same and once they get the job/car they will just do it when it suites them :)

Maybe I am a Cynic, but getting an answer from these blokes is like pulling teeth :(

Piggaz Grand Master

Piggaz

Posted
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Haha, your such a nice bloke Joey, these blokes do not give a F , and they seem to be all the same and once they get the job/car they will just do it when it suites them :)

Maybe I am a Cynic, but getting an answer from these blokes is like pulling teeth :(

And from what you've said, your workshop ain't too much different :P
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  • 1 year later...
SimonR32 Grand Master

SimonR32

Posted
Posted

So my motor finally let go with the Grex (Trust) drop in cams (never knew if they were 256 or 264), the RB26 makes 740hp at the hubs at 2bar of boost with a Precision 6262. As I don't have dial in specs for them I decided now was as good a time as any to buy some Tomei Poncam Type R to search for some lower end power. These arrived on friday and gave me some motorvation to start stripping my current spare motor on Sunday... To my luck I pulled out the cams and measured them, found they were a little too big for stockers so googled the stamped number on them, turns out they are Tomei Poncam Type B.

So now I have 3 sets of drop in cams

  • Grex 256 and or 264 9.1mm
  • Tomei Type B 260 9.1mm
  • Tomei Type R 250 9.1mm

Decisions.... hmmmm

SimonR32 Grand Master

SimonR32

Posted
Posted

What let go, Simon? And pics of the carnage?

Went down to the drags because I had a small rear main seal leak and figured I'd lunch a gearbox so kill 2 birds at once. It didn't feel 100% on first pass (went 10.8 @ 135mph so was definitely down on power) and then the motor felt a little rough on the way back to pits. Checked logs and bosst was down 3-4psi, played with the boost control settings in Vipec and started back up to a small tick. Shut down straight away, rang my mate who helps with the car and by the time he wandered back (a few min) it had cooled down a bit more. Started back up to very big knock and shut down straight away again. It's either a bad big end or a rod bolt has let go. Motor is still in the car but will come out soon hopefully, it lasted about 6000kms of basically track only use for 3 years so can't be disappointed with that. I've been savage on it the last few months holding 4th gear until 9000rpm running 2bar down the back straight at Barbagallo so I've got a fair idea why it has cried enough haha

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