500.1 Rwhp (592@fly) From Stock Rb25det - Now Need Dry Sump Help

[bren]

We hit 500.1rwhp (592@fly) on a Dyno Dynamics rr this week.

Stock RB25DET bar Tomei 1.8mm head gasket and ARP stud and nut kit (after head lifted at 461rwhp with stock gasket and bolts) running 1.8bar on GT35R and race fuel.

The car runs 460rwhp (546@fly) on pump fuel.

Or it did, we killed it due to surge yesterday on track.

Im thinking of dry sumping the car as its a competition machine and does very little road miles.

I have searched for info but am struggling to find a great deal, can anyone shed any light on a dry sump system and give any hints and tips? I have another engine arriving on Tuesday but Im not installing it without sorting the surge issue. Ill be sorting restrictors for the head but would rather do the job properly with dry sump rather than baffle.

FYI the cars spec includes:

Completely stock engine bar MHG and ARP head stud and nut kit

Motec M800

PPG 5 speed dog box

Greddy TD06 kit but with the turbo replaced with a GT35R

OS Giken twin plate

R33 GTR diff and driveshafts (we managed to snap both standard shafts with one enthusiastic launch!)

The pic was taken at the first round of the EDC (European Drift Championship) this year. After a full season of hard work it now looks a little work weary but we have a new kit and full aero package (front and rear fenders, new custom bumpers, custom skirts, splittter, diffuser, wing and flat under panelling and full respray) planned over winter.

Edited September 3, 2007 by bren

[NYTSKY]

Nice work. There is another skyline RB25 on here that runs a dry sump setup.Its used for drag racing.

Campbell is his name on here.

This is a video of his car.

[munro'sgts-t]

hey mate shoot a pm to (r33 racer) he has a dry sump set up on his rb30/26 i no its not a rb25 but very similar he may be able to tell u a bit about it

[bren]

hey mate shoot a pm to (r33 racer) he has a dry sump set up on his rb30/26 i no its not a rb25 but very similar he may be able to tell u a bit about it

Ive pmd Cambell but have searched through the members listing and the only r33racer I could find only had 5 posts and a relatively standard car by the sound of it

[bren]

Ive found R33_racer and pmd him, thanks

[munro'sgts-t]

oh yeh sorry bout that it is r33_racer my bad but not to worry u found him now good luck with it

[fEkuaR]

Just out of interest why do you use a standard bottom end and not do a forged build? Is it to prove the strength of the factory engine? Just curious not trying to start any sort of debate the results are very impressive.

Also a heads up you posted your results in the rb26 thread not the rb25 thread

Edited September 2, 2007 by fEkuaR

[bren]

I had another lump built with Tomei pistons, rods, Poncams, head gasket and ported head. We fitted it, ran the car for a few hundred miles but it smoked. We took the cam covers off to find that the head builder (a very respectable race engine builder in the UK) had left all the guides sat too far up in the head so the valve retainers were kissing the valve stem seals.

As a result the stem seals were battered and allowing oil to pass into the cylinders. We had a drift made and tapped the guides to where they should sit but the car then turned into a comedy joke machine and produced HUGE clouds of white smoke like youd get at your local club. We pulled the inlet manifold off to find oil running down the inside of two of the inlet ports from cracks in the head. The head builders had removed a rediculous amount of material when porting and weakened the head to the point where knocking the guides into position caused the head to fail. Oil deposits on the back of the valves from one cylinder indicate that the head had been weaping oil through a crack in the head all along. By this time it was 3.30am so we called it a day.

My tuners turned round another head in two days, built it back up, fitted it to the car and chucked it on the dyno. The engine spun a bearing after the first power run due to the crap in the sump from the valve stem seals.

To get the car running again for the last EDC competition we chucked the old standard engine back in.

We now need another crank, 1x conrod, MHG, oil pump and engine gasket set so I can have the strong motor built back up. In the mean time Ive had to source another standard engine as the car works for a living as a demo vehicle and is being shipped out to Sweden in just over week. Its then doing a demo day for one of the UK Skyline Owners clubs in Wales followed by a trip to the Nurburgring the week after followed by a trip to another Skyline Owners club day in Scotland the week after that. We cant afford any downtime so have to run the car using whatever means necessary

Ive reported the other post and asked the mods to move it to RB25 results.

We came 4th in the last round of the EDC despite our driver snapping both drive shafts just before he went out in the semi finals. We changed both driveshafts in 12 minutes dead but missed our slot in the semis and could only fight for 3rd and 4th place. The car performed really well so we thought wed have a go at the last round of Time Attack shich is on tommorrow. We just needed more power as we are down on power with 500rwhp, let alone trying to be competitive on pump fuel. We had no choice but to eak out every last bhp from the stock engine and hope it held together. Apart from the head lifting it was fine, no problems with the power, just with surge.

Edited September 2, 2007 by bren

[fEkuaR]

Sounds like you have had a spot of bad luck, sorry to hear about your other engine. It must be frustrating when so called professionals destroy an expensive engine. Are they accepting any responsibility for the damaged engine?

It goes to show how well built a standard bottom end is. Which no doubt has had a reasonably hard 10 years of being driven even if on standard power can still hold up to huge stress.

All the best with the car in the upcoming events.

[shanef]

yeh michael is one of the best people to talk to re the dry smup setup, he's more than happy to give pics and heaps of info about it all (he helped me with mine)

P.S r33_racer (micheal) has a 25/30

[r33_racer]

you have pm mate!

[bren]

Its not the best that they wrecked the head and subsuently the rest of the engine but hey ho, thats motorsport. Ill get the money back that I paid them for the head work and for the head itself but wont get a penny for anything else. Its going to be a struggle to get the head money back, Im already preparing to see them in court as their attitude to the whole thing stinks and they are trying to shift the blame at all times.

Michaels sent me a pm, hell probably regret it as Ive fired back a whole list of questions. Hope hes a patient sort of guy!

This sites a breath of fresh air, GTSTs just dont exist in motorsport in the UK and its good to see you guys take them seriously We are 6 seconds off the pace of the leading Time Attack car but then we had a 6k rpm limit (rather than the usual 7800), only managed a total of 22 test laps with the car dropped on track out of the box with my best guess (and wrong) spring rates ands alignment settings, running pump fuel rather than race and with a standard GTR diff that was spinning its inside wheel all the time (we thought a standard GTR plated better than the drift 2 way for track work, we were wrong). With that lot sorted and with full aero I dont see why we couldnt make up the majority, if not all, of that 6 seconds defecit. The current cars have been testing and developing as Time Attack cars at least all of this season. We had two weeks to turn a drift car into a track car! :laughing-smiley-014: It was worth a try.

Roll on next year, Ill show the UK what a GTST is capable of.

Edited September 2, 2007 by bren