Piglet's Rebuild Of His Busted Tomei 2.8

[levinboy]

A lot of gay in this thread

Needs more limiter launches

[33GTRV]

its ok pauly, i know how good your massages are. Ignore all these haters, they be jealous baby. Ps. Tell yavuz ily. You at the races on cans?

[Piggaz]

its ok pauly, i know how good your massages are. Ignore all these haters, they be jealous baby. Ps. Tell yavuz ily. You at the races on cans?

Yeah man, down at the F1. 8 of us.

[wedge_r34gtr]

Yeah man, down at the F1. 8 of us.

lucky bastard

[Piggaz]

Car got ran up yesterday with new injectors. Negative. Yavuz has pulled 35% of charge time from the coils and it still fires so that rules that out. Going to try new plugs with mega small gaps to totally rule that out then we will change springs.

[33GTRV]

I have a feeling it could be a sticky spring with these cams mate. Have they checked for bind and the progressive spring tension? With the ramp on the valve train it is a likely cause.

[ezy_09s]

Well it doesn't leave too many things it can be now . Just hope it is a plug problem , quick & easy in comparison to a spring swap .

Btw , what plugs are you running? Coppers or an electrode-less type .

[Piggaz]

I have a feeling it could be a sticky spring with these cams mate. Have they checked for bind and the progressive spring tension? With the ramp on the valve train it is a likely cause.

Seat pressures are 48 lbs on the intake and 50 on the exhaust. Not much over standard which is a bit of a shit go considering these are "Step 2" HKS. Once again, the Jap stuff is mild as!!!

[Piggaz]

Well it doesn't leave too many things it can be now . Just hope it is a plug problem , quick & easy in comparison to a spring swap .

Btw , what plugs are you running? Coppers or an electrode-less type .

Just coppers mate.

[Ants]

All I can say to you Paul is that I hope you fix this soon because tomorrow is F1 race day. So get a few (or lot brewskis) into ya and forget about tuning the car right now.

And yes im on to my third beer and life is good.

[Marko R1]

couldnt agree with you any more anthony - im getn my drink right now

[Piggaz]

All I can say to you Paul is that I hope you fix this soon because tomorrow is F1 race day. So get a few (or lot brewskis) into ya and forget about tuning the car right now.

And yes im on to my third beer and life is good.

Bit hard when you're staying with your tuner . As for beer count... Not sure. 12 plus so far? Quiet night... Big night will be tomorrow haha

[r33_racer]

Seat pressures are 48 lbs on the intake and 50 on the exhaust. Not much over standard which is a bit of a shit go considering these are "Step 2" HKS. Once again, the Jap stuff is mild as!!!

Should be more like almost double those figures for the sort of rpm/boost you would be running. Like around 80-90 lbs. Perhaps with your new aggressive valve train/cam setup the valve springs were not spec'd correctly and your getting some valve float in that upper rpm range.

[Piggaz]

Should be more like almost double those figures for the sort of rpm/boost you would be running. Like around 80-90 lbs. Perhaps with your new aggressive valve train/cam setup the valve springs were not spec'd correctly and your getting some valve float in that upper rpm range.

We think that's exactly what's happening. I spoke to Yavuz today and when we are both sober we will sit down and talk about what we need. We also need to factor in the new cam we are going to try soon. Something around 255 @ 11.3 with a HUGE ramp, so we need a spring to be able to close the valve at high RPM.

[r33_racer]

Well it seems like the logical explanation. There doesn't really seem to be too many other obvious options left that explain the problem.

[Piggaz]

Well it seems like the logical explanation. There doesn't really seem to be too many other obvious options left that explain the problem.

Definitely sounds that way. I'll be devastated if we change then and this issue is still there.

[SimonR32]

We think that's exactly what's happening. I spoke to Yavuz today and when we are both sober we will sit down and talk about what we need. We also need to factor in the new cam we are going to try soon. Something around 255 @ 11.3 with a HUGE ramp, so we need a spring to be able to close the valve at high RPM.

Mine's do cams of similar spec if I remember correctly

[Piggaz]

Mine's do cams of similar spec if I remember correctly

Yeah, 252 @ 10.2 mm. Not many use them, I think the price would have something to so with that!

[Piggaz]

OK guys.

I was out at Unigroup today. New (stiffer) valve springs have been ordered. They will be here on Tuesday, hopefully installed on Tuesday/Wednesday. Yavuz wasn't there so I dont know the details but i'm sure they are more than sufficient for the task!

Now. I have some overlays

This graph is the only two runs we have done with the boost controller on so it's hardly 'optimised'. We did those two runs with the controller on when we were trying to diagnose the "miss". Funnily enough the curve starts to flatten off as soon is it does it's thing. Either way, im very happy with the midrange this thing is putting out! (No cm timing has been played with yet.... It's as the engine got put together. Also, at 19 PSI we have seen 417 rwkw. I can't remember what RPM that was at. I forgot to get a graph of that run)

Playing with the computer, I dug out these two graphs for a comparison. The black line is my first ever tune with the GT-RS's on pump fuel and the red line is my finished tune just before the engine died last year. Funnily enough, the boost controller was turned ON with the RS's and OFF with the -5's. Haha!

I think I need new tyres!

[Marko R1]

wow! looks like a gain of 50kw @ 4krpm!

must be happy & must be hanging to drive it

so with the gtrs's u were making 200kw @ 4krpm & now you are making ~340kw with -5s & latest setup

what is the difference in the run with the blue line v's the brown line (in the 1st graph) or is it just 2 runs where you were trying to diagnose the miss?