Frankiman's street/track GTR project

[DJ]

wow that's a really good surprise.The first dyno screen picture of the sr20 ae86 is my buddy's ,he uses it mostly for drift it's barely on the street ,but it is street legal and man can you say traction problems ?lol

[love_boost]

wow nice numbers!
did you ever get a surprise lol, i like how he just had to listen to the exhuast and he knew haha

[RHDskyline]

Thats awesome. I love this build sooo much

[Oakville]

Thats awesome. I love this build sooo much

x2, I'm always looking forward to the next chapter in Frankimans story!

[Skym]

I like.

High pressure Nismo radiator cap is for thicker Nismo radiator only. Not a good idea to use on stock radiator, as it creates higher pressure than normal, which creates leaks in cooling system.

[frankiman]

I like.

High pressure Nismo radiator cap is for thicker Nismo radiator only. Not a good idea to use on stock radiator, as it creates higher pressure than normal, which creates leaks in cooling system.

i'll be taking care of that next year :wink:

[Rapier46]

How long did they(turbos) spin for after you turned it off? Because my stock turbos ony gtr, (when they were good) kept spinning for about 15 seconds. After the engine was turned off.

[frankiman]

How long did they(turbos) spin for after you turned it off? Because my stock turbos ony gtr, (when they were good) kept spinning for about 15 seconds. After the engine was turned off.

oem turbos have roller ceramic bearings which stop spining almost as soon as the engine stop

ball bearings turbos keep spining for about 4 seconds (depending on turbos)

what you heard for 15 seconds must have a been a pressure relieve valve or something

[Rapier46]

oem turbos have roller ceramic bearings which stop spining almost as soon as the engine stop

ball bearings turbos keep spining for about 4 seconds (depending on turbos)

what you heard for 15 seconds must have a been a pressure relieve valve or something

No that's wrong.... Look at some vids man bb turbos spin for a while. Sometimes 30 seconds. It was 100% turbo wheels spinning. I'm not some backyard mechanic. Most of the time I know my **** haha

[Skym]

I think stock R32GTR turbo's are 270 degree sleeve bearing.

Could be stock R34GTR turbo's which are ballbearing and capable of around 460hp at engine with basic breathing mods, etc on a R34GTR RB26.

If you do use car on racetrack, I would suggest you fit a air separation bottle (removes bubbles from cooling system) that comes with a higher pressure radiator cap -

http://www.trust-power.com/04cooling/breather_tank.html

Also add a N1 waterpump if engine hasn't got one, to reduce cavitation (creation of air bubbles) at higher rpm's.

[frankiman]

No that's wrong.... Look at some vids man bb turbos spin for a while. Sometimes 30 seconds. It was 100% turbo wheels spinning. I'm not some backyard mechanic. Most of the time I know my **** haha

thats why i said

(depending on turbos)

[Rapier46]

Oh. Haha sorry I didn't see that

[frankiman]

adjustable intake cam gear, effective?

check my dyno tune for reference

this is the situation,

for twins, i have alot of lag see chart;



full boost, which is ONLY ~13psi is at 4500rpm, pretty high

i'll be getting a new tune next year, with only a couple new mods, but most importantly it will be a much more aggressive tune

i have stock cams, and will keep stock cams

but ive heard that using adjustable cams gears, to advance or retard cam timing just a bit, can drastically change the caracteristics of the power curve (power delivery)

and tuning cam timing can also reduce spool-up time

but heres the thing, ive talked a bit about it to Robin Almasi who tuned my car in the first place, he said that adjusting cam timing while on the dyno is a PITA

for every adjustment, you have to let the engine cool a bit, to take the cam gear cover off (and CAS), make the adjustment, put everything back on and align th CAS correctly, which at 100$+ /hour on the dyno is not financially feasable

and from what he told me, hes done it on a couple R32s already, and the peak power increase is always negligeable


heres what i'm getting at;

a used adjustable cam gear is cheap (ish)
and if i were to get on the dyno with a similar setup (pic only for reference)



by similar setup i mean, fabricating some CAS spacers, and only using a INTAKE cam gear, it could be extremely easy and quick to make adjustments on the spot while on the dyno


my question is

would it be worth it to do this, to get quicker spool
i can probly get a cam gear for less than 140$, spacers i don't know, and the actual tuning wouldn't cost much more

[Rapier46]

Is the cas really importat to return to the same spot? What happened if you turn it a little bit either way?

[SkyLizzle]

Is the cas really importat to return to the same spot? What happened if you turn it a little bit either way?

I wqould belive so since CAS is the Cam Angle Sensor dun wanna **** around with that!