Getting tuned next week

[Dragon Humper]

Bring your own fuel, US fuel is not as good as ours. Some areas have 94 octane but most have 91. Their 91 is more like our 89....maybe 90....maybe.


Jon.

[nimblestix]

Bring your own fuel, US fuel is not as good as ours. Some areas have 94 octane but most have 91. Their 91 is more like our 89....maybe 90....maybe.


Jon.

Not so certain about that these days.
An employee of racing greed I personally know has performed test with rg's mustang rolling dyno that he claims show otherwise.

In fact: the USA's 92oct out performs canadian chevrons 94oct.

In the same vehicle (2000's subaru) which I don't remember exactly the model, year, or specs of, the car made more power and torque with the American 92oct fuel than our 94 chevron. Or perhaps you could say the car knocked/detonated far less than with our Canadian slurry we call 94.

I think we as Canadians are being played!

[gtrjon]

Not so certain about that these days.
An employee of racing greed I personally know has performed test with rg's mustang rolling dyno that he claims show otherwise.

In fact: the USA's 92oct out performs canadian chevrons 94oct.

In the same vehicle (2000's subaru) which I don't remember exactly the model, year, or specs of, the car made more power and torque with the American 92oct fuel than our 94 chevron. Or perhaps you could say the car knocked/detonated far less than with our Canadian slurry we call 94.

I think we as Canadians are being played!

it was tariq's wrx. I was going to ask john how he felt about this and if he has ever done any tuning of his own with US chevron or shell 92 in comparison to our 94

[Skym]

man i like what im seeing in here with my gt2860-5 i was aiming for 350 but look like im going up i have lot more modds that could pump up the horses..

It's common (done on many GTR's) to get around 536awhp with those GT2860-5 turbo's when pushing to limit's on dyno (from memory it was around 1.7bar), but they start to run out of puff on pump gas (98 octane), so the advice above with higher octane gas is correct (E85 is better, as another 50-100hp is possible due to being able to run more ignition timing, runs cooler, etc. But like Methonal, can get bad fuel economy, so racetrack, dyno only).

If want similar torque, hp on pump gas (as you would filling up with E85), HKS GTRS or Garrett equivalent, HKS or Tomei cams to suit, HKS or Tomei 2.8 litre bottomend (or RB30).

So i will be getting tuned next week and just curious as to what power i will be putting down. I have a 91 GTR with a downpipe back exhaust with cat delete pipe, HKS suction kit, and nistune running 13psi. Stock fuel system, stock turbos, and stock internals.

So if anyone knows what they usually put down with these mods let me know, just want to see what everyone has say so i have something to compare to after its tuned and all. (i know every car is different but a general idea is all i am looking for)

Thanks for any insight

whose tunning her if you dont mine telling..

Around 350hp at engine is common with intake, exhaust, ECU tune (I would think with conservative tune).

With ECU tune it can be from 20hp on a conservative tune to 40hp on a aggressive tune. More if go with E85 fuel. To compare, max on RB20DET is 30hp and 15hp with conservative tune.

You can run Martini fuel in fuel tank with pump gas (on left side in link below) to give it a boost in octane, which allows more ignition timing to be run (ignition timing is where the hp is made and what wakes engine up) -

http://www.martiniracing.com.au/index.php/our-products/race-fuel

Also bonus of mixing with pump gas is better fuel economy (best of both worlds).

[gAWDzla]

great info, i am glad i made this now. Down the road i want to run a surge tank with a aeromotive A1000 with a pair of GT2860-7's on E85 or 110 octane. and what cams would you guys suggest? I like tomei stuff but imo i think its over priced. And going to a 2.8 stroker or rb30 bottom end is a little out of my price range at the moment. I appreciate any tips or advice you guys have!!

[Dragon Humper]

Not so certain about that these days.
An employee of racing greed I personally know has performed test with rg's mustang rolling dyno that he claims show otherwise.

In fact: the USA's 92oct out performs canadian chevrons 94oct.

In the same vehicle (2000's subaru) which I don't remember exactly the model, year, or specs of, the car made more power and torque with the American 92oct fuel than our 94 chevron. Or perhaps you could say the car knocked/detonated far less than with our Canadian slurry we call 94.

I think we as Canadians are being played!

It could have changed but, just recently (Nov.) I went to Bellingham to fly to Vegas and loaded up with 91. I have a Diablo high octane tune in my truck which deals with our Husky 89 just fine. As soon as I pulled out of the gas station and stomped on it the engine had a total hissy fit, the knock sensors must have lit up like a Xmas tree, it was quite violent. Once it settled down I could feel that it was down on power. As soon as I topped up with some Chevron 94 in Hope, all was well again.



Jon.

[gtrjon]

i think you may be mistaken john. there is 92 octane in WA not 91

[gAWDzla]

just about any gas station around me carries 93 octane or higher, a hand full have E85 and randomly i will come across a station with 110 octane.

[Skym]

Tomei Poncams, 260 duration.

[gAWDzla]

Tomei Poncams, 260 duration.

The 260 intake and exhaust? and how much hp will these support?

[Skym]

Tomei Poncam Type B (engine has a lumpy idle) -

http://www.tomei-p.co.jp/_2003web-catalogue/e070_cam_RB26.html

Around 536awhp is common with those spec cams. Mines cams are similar (similar specs), but I think have more lift and have seen slightly more awhp on a R34 GTR. Once go past I think was 10.25mm lift, have to modify head, as the cam lobes foul the head (lobes are too tall).

The difference between cams with hp, torque is noticable at lower boost levels (more aggressive cams produce more hp, torque). Once boost level is raised to peak, all brands of cams seem to become close with torque, hp (maybe slightly higher or lower, but similar amount) they can produce (head becomes a restriction). At least that's what I have seen on dynocharts when comparing different brands of cams at different boost levels.

Tomei Poncams are designed to make valve springs, etc last, work with stock head, stock ports, stock valves, stock intake manifold, stock exhaust manifold, etc, so not as aggressive. I think the Procams are the more aggressive cams, hence more torque, hp is produced throughout powerband and require higher lift valvesprings, Tomei lifter, etc upgrades.

This is what cam manufacturers asks for if buying custom cams to suit your engine (their cams seem too produce more hp at lower boost levels, similar to Procams) -

https://www.capella.co.nz/sites/kelford.co.nz/design-shop/

Also a stock R32 GTR with catback exhaust, podfilters, ECU tune, 14psi produces around 333rwhp (2wd mode). With front pipe expect more rwhp. Stock is around 241rwhp (close to 306hp at engine). The 280hp claim at factory (engine) is a bit low, although the hp output does vary between cars due to internal wastegate springs being at different psi, etc.

You get less hp at wheels in 4wd mode. In drag racing the more rear bias you run with 4wd, the better the 1/4 mile time, trap speeds you'll get (more hp to wheels). Cheap way to get some more hp at wheels on dyno (pull 4wd fuse).

[nick-nismo]

Not so certain about that these days.
An employee of racing greed I personally know has performed test with rg's mustang rolling dyno that he claims show otherwise.

In fact: the USA's 92oct out performs canadian chevrons 94oct.

In the same vehicle (2000's subaru) which I don't remember exactly the model, year, or specs of, the car made more power and torque with the American 92oct fuel than our 94 chevron. Or perhaps you could say the car knocked/detonated far less than with our Canadian slurry we call 94.

I think we as Canadians are being played!

i remember talking to tariq about this, the car picked up 8 more awhp, i think it was from our chevron 94 knocking and us gas not.

[gAWDzla]

Tomei Poncam Type B (engine has a lumpy idle) -

http://www.tomei-p.co.jp/_2003web-catalogue/e070_cam_RB26.html

Around 536awhp is common with those spec cams. Mines cams are similar (similar specs), but I think have more lift and have seen slightly more awhp on a R34 GTR. Once go past I think was 10.25mm lift, have to modify head, as the cam lobes foul the head (lobes are too tall).

The difference between cams with hp, torque is noticable at lower boost levels (more aggressive cams produce more hp, torque). Once boost level is raised to peak, all brands of cams seem to become close with torque, hp (maybe slightly higher or lower, but similar amount) they can produce (head becomes a restriction). At least that's what I have seen on dynocharts when comparing different brands of cams at different boost levels.

Tomei Poncams are designed to make valve springs, etc last, work with stock head, stock ports, stock valves, stock intake manifold, stock exhaust manifold, etc, so not as aggressive. I think the Procams are the more aggressive cams, hence more torque, hp is produced throughout powerband and require higher lift valesprings, Tomei lifter, etc upgrades.

This is what cam manufacturers asks for if buying custom cams to suit your engine (their cams seem too produce more hp at lower boost levels, similar to Procams) -

https://www.capella.co.nz/sites/kelford.co.nz/design-shop/

Also a stock R32 GTR with catback exhaust, podfilters, ECU tune, 14psi produces around 333rwhp (2wd mode). With front pipe expect more rwhp. Stock is around 241rwhp (close to 306hp at engine). The 280hp claim at factory (engine) is a bit low, although the hp output does vary between cars due to internal wastegate springs being at different psi, etc.

You get less hp at wheels in 4wd mode. In drag racing the more rear bias you run with 4wd, the better the 1/4 mile time, trap speeds you'll get (more hp to wheels). Cheap way to get some more hp at wheels on dyno (pull 4wd fuse).

What about the Tomei 270's? They make a Hi type cam and a Mid type cam. Anyone using these?

[Dragon Humper]

i think you may be mistaken john. there is 92 octane in WA not 91

Possibly, but that makes it even worse....lol.

Definately make sure the fuel is the best in your area and very fresh. Can't see why you can't be able to lay down 350whp on a stingy Mustang dyno.



Jon.

[Skym]

What about the Tomei 270's? They make a Hi type cam and a Mid type cam. Anyone using these?

Not that I know of, they mainly use Tomei Poncams (260 duration on both cams) with those turbo's. Basically copying Mines R34 GTR demo car engine specs.

270's are fitted around 650hp-700hp at engine (common on 650hp RB26 Group-A engines, which gives them that wicked idle), but Poncam specs can stretch to 700hp (when you would change to 270 duration). But with some turbocharged racecars the cams, turbo choice can change between racetracks (hp racetrack, etc), depending on what they want from engine.

Also 4.11:1 diffheads (R33 GTR V-spec) with R34 GTR gearbox gives shorter ratio and is probably part of why Mines R34 GTR demo car is so responsive, quick (some apply this to R32 GTR, as diffheads are 4.11:1 stock and fit Nismo R34 GTR gearbox conversion kit).