Stuck At 300kw.

[Aazzy]

I run an rb26 in a s13.5 silvia and the last time it was on the dyno, struggled to crack 300rwkw. I was aiming for 350kw plus. I'm not sure what's got to change to get there. It has a set of new -7's at the moment, but I have some hks 2530's also. Hks 264 cams, hks 800cc injectors, hks rail, forged Pistons, rising rate pressure reg, nitto oil pump, nitto collar, crank was ground and balanced etc... microtech LT12s, Ross balancer. Tuner says everything is sweet but I guess I just expected more. Only thing I'm unsure of is the fuel pump. can I just hook up an 044 and use whatever's in the tank as a feed pump? or is there a few more mods that need to be done?

[Piggaz]

What is the exhaust parts?

[Aazzy]

It's got hks dump pipes, hks front pipe, no cat, 3 inch, cannon on the back just for looks.

[r32-25t]

To see 350 out of -7s you're going to need an exhaust that's bigger then the one you currently have, run e85 and lean on the boost. You probably also need a crank trigger system so that you tuner can lean on the timing a lot more

Also 350 is going to be your limit with -7s even with e85

[Aazzy]

I had a feeling you were going to say that about the -7's. It was a cock up to begin with, a customer of ours runs a workshop that specialises in turbos, I wanted -5's but somewhere along the line -7's were sent instead. I got them for a pretty good price so I didn't want to rock the boat. I was after an upgrade from the hks 2530 turbos which i thought were stuffed because they started pumping out white smoke one day at the track, but as it turns out, the new turbos did the same thing. it was an oil drain issue and the bloke that checked them out just assumed the turbos blew. He also told me they were shit and not worth fixing. Hence the new -7's. I guess I could sell the hks turbos and the -7's then get something a bit bigger. Any recommendations?

[r32-25t]

A 2530 and a -5 are very close to each other in terms of response and power that can be achieved, going from 2530s to -5s is more of a sidewides step.

The only bigger bolt on is the -10/gtrs but it well documented that are terrible turbos and really don't work on anything under a 3L

Your other option is do the same as everyone else and go with a modern big single, which allows you to have great response and great power

[.R33.]

If you can, grab a set of -9 / gt-ss and throw them on. Great turbos, will get your 350kw goal easily and have better response than thr -5.

(And then give me your -7 ?)

[r32-25t]

-9 runs out at 320-330 on 98

[Aazzy]

I'm thinking I'll run the motor in with the -7's (since they are already bolted up), make sure the motor is all good and then try the big single route, once I know everything is holding together. I've been reading up a bit since I posted this and a decent single does seem like the way to go. I need to spend a bit of time on suspension also before I get any faster.

[CEF33Y]

I had a feeling you were going to say that about the -7's. It was a cock up to begin with, a customer of ours runs a workshop that specialises in turbos, I wanted -5's but somewhere along the line -7's were sent instead. I got them for a pretty good price so I didn't want to rock the boat. I was after an upgrade from the hks 2530 turbos which i thought were stuffed because they started pumping out white smoke one day at the track, but as it turns out, the new turbos did the same thing. it was an oil drain issue and the bloke that checked them out just assumed the turbos blew. He also told me they were shit and not worth fixing. Hence the new -7's. I guess I could sell the hks turbos and the -7's then get something a bit bigger. Any recommendations?

Sounds like you need a new turbo guy!