I just want more damn power! Having been fortunate enough to drive some HUGE hp Z32s (850hp being the most powerful), I've decided I just can't handle 1bar and most have more!

 

I'm going to be pushing the stock motor a little, but I'm confident it can take it if done correctly. Jimmer rebuilt me a fine engine a decade ago and I'm keen to see how drivable it will be with the correct modifications.

 

I've gotten to the point where everything else has been upgraded except the clutch, so with the exhaust, Brembo brakes, single piece prop and the general amazing health of the engine and turbos, it's time to do something a little more.

 

The plan is 555 injectors, Profec B, 2.5" intake, possibly a Selin Translator and a MUCH better clutch and a full day rolling road tune with a Nistune board I hope to get close 400hp although I'm not chasing power figures, drivability is first and foremost so response and turbo spool are what I'm more interested in. Whilst that won't seem like much to sum, I am keen to retain drivability and see how good the stock block and heads actually are. Have also considered the JWT cams and I think I can get a good reliable figure. A good map is key and I've found someone good to do it.

 

I will most likely need RLTC just for safety.

 

If it doesn't last, Power Enterprise turbos and some better pistons will be bought.

Ah yes that too! My intention was to have a specialist replace the 2" outlets on my Greddy coolers with 2.5". Assuming the cost is less than me selling them and buying a new set. Possibly an option for you too Simon?

 

I too have thought about this option. However...I have a concern, not just in referance to swarf deposits but in the design. Obviously the BA intercoolers are designed to help with the flow resistance through the system. Removing the bottle neck that is the inlets may not be the only factor, can the intercooler itself cope? You could end up with the cooler core itself becoming the bottle neck. Rendering your modification useless.

At the end of the day Si you know the options, more than most. You've got a very solid block to add to, it's kinda wasted running less than 400hp. I'm guessing, knowing you, you want something kinda punchy without too much lag as apposed to a dollop of power. How about

MSP manifolds with 3" expansion downpipes. Mated to a pair of z1 gt525 or 535 turbos.

2.5" intercoolers and pipework with a selin.

Set of Nismo 555 injectors

That little lot with a good map should deliver a very smooth and lag free curve good up to about 500fwhp. Obviously you could knock it back to a lower Psi and net a cool 430-450bhp all day long. There is very little point in removing the stock turbos if you have no intention of going over 400fwhp, you can cross that mark with breather mods.

Like I say, you know the score.

At the end of the day Si you know the options, more than most. You've got a very solid block to add to, it's kinda wasted running less than 400hp. I'm guessing, knowing you, you want something kinda punchy without too much lag as apposed to a dollop of power. How about

MSP manifolds with 3" expansion downpipes. Mated to a pair of z1 gt525 or 535 turbos.

2.5" intercoolers and pipework with a selin.

Set of Nismo 555 injectors

That little lot with a good map should deliver a very smooth and lag free curve good up to about 500fwhp. Obviously you could knock it back to a lower Psi and net a cool 430-450bhp all day long. There is very little point in removing the stock turbos if you have no intention of going over 400fwhp, you can cross that mark with breather mods.

Like I say, you know the score.

 

Yup - what Steve said....:wink:

At the end of the day Si you know the options, more than most. You've got a very solid block to add to, it's kinda wasted running less than 400hp. I'm guessing, knowing you, you want something kinda punchy without too much lag as apposed to a dollop of power. How about

MSP manifolds with 3" expansion downpipes. Mated to a pair of z1 gt525 or 535 turbos.

2.5" intercoolers and pipework with a selin.

Set of Nismo 555 injectors

That little lot with a good map should deliver a very smooth and lag free curve good up to about 500fwhp. Obviously you could knock it back to a lower Psi and net a cool 430-450bhp all day long. There is very little point in removing the stock turbos if you have no intention of going over 400fwhp, you can cross that mark with breather mods.

Like I say, you know the score.

 

Think you're missing the point of what I want to achieve here. I want to push the stock block (and I have a completely stock block/heads and turbos) without removing the engine for a full rework. If I ever do have the engine pulled, I won't be fitting GT525/535s. I'll be digging deep for Power Enterprise PE1420 turbos. Widely heralded as the most responsive turbos for the Z32. I've driven a few cars with these turbos fitted and when set up correctly, they are a pure delight.

 

I'm not necessarily chasing a top figure and a stupid punch, but something tame around 400hp should give me a fast and responsive street car. I want driveability and responsiveness. The stock turbos are actually good for response up to a limit and I'd like to explore that limit freeing up airflow and taking out some of the restrictions Nissan placed on the unit to bring it closer to the stupid 'gentleman's agreement'.

 

555s, Nistune, larger intake hardwear, JWT mild cams and possibly a Selin and if I really have the patience, some 240sx/Stanza throttle housings - should give me something very exciting for a stock-ish road car.

I had it in my head you had had a Jimmer rebuild with weiscos. If your not interested in pulling the block your kinda restricted to bolt ons. So a parts list as such;

2.5" intercooler piping, 2.5" intercoolers. Selin dual MAF.

3" expansion down pipes.

555 injectors

That lot might make 400rwhp. But I don't think you'd be up running it up to the limit to push much beyond that. Your going to change response and make a much punchier car without peak power power. Tbh si a set of 555s and the dual MAF with a custom map alone will net you significant gains. Really depends what you want to spend.

I had it in my head you had had a Jimmer rebuild with weiscos.

 

I thought he had a forged rebuild as well.....

 

As myself and AndrewG will cheerfully tell you, Si: the Selin setup makes a very noticeable difference to the driveability. For me, it's probably the most worthwhile modification (engine-wise) that I've made. :thumbup1:

Ah yes that too! My intention was to have a specialist replace the 2" outlets on my Greddy coolers with 2.5". Assuming the cost is less than me selling them and buying a new set. Possibly an option for you too Simon?

 

That's precisely what I've done to my Z1 intercoolers (modified to 2.5 inch ports)

Think you're missing the point of what I want to achieve here. I want to push the stock block (and I have a completely stock block/heads and turbos) without removing the engine for a full rework. If I ever do have the engine pulled, I won't be fitting GT525/535s. I'll be digging deep for Power Enterprise PE1420 turbos. Widely heralded as the most responsive turbos for the Z32. I've driven a few cars with these turbos fitted and when set up correctly, they are a pure delight.

 

I'm not necessarily chasing a top figure and a stupid punch, but something tame around 400hp should give me a fast and responsive street car. I want driveability and responsiveness. The stock turbos are actually good for response up to a limit and I'd like to explore that limit freeing up airflow and taking out some of the restrictions Nissan placed on the unit to bring it closer to the stupid 'gentleman's agreement'.

 

555s, Nistune, larger intake hardwear, JWT mild cams and possibly a Selin and if I really have the patience, some 240sx/Stanza throttle housings - should give me something very exciting for a stock-ish road car.

 

Slightly off topic, but PE1420's are OLD tech now in turbo land. A Garrett GTX28 will out perform a PE1420 in every possible measurable manner.

and possibly a Selin

 

should read definitely a Selin!

I agree. I believe a Selin should be the first mod done before anything else.

Good thread Simon, some interesting inputs and experiences here.