Matching Plenum To A Built Motor With 2530's Running Flex Fuel 98 / E85

[Roy]

Well I have been in and driven a few cars with the Greddy inlet plenum and as a package the cars have been animals. One runs 2530s the other T518z. Be an interesting comparison as loads of 9sec drag cars run the Greddy Plenum....and yeh, yeh , yeh you are all going to go on about drag cars and response....well at least drive a car with a Greddy plenum before you knock it

[Sinista32]

Thanks to all the contributors of this thread. All have their own experience/knowledge and it's an informative read.

I recently organised a GB on the NISMO plenum, 4 in SAU have taken it up, and I expect them to be received soon.

The claim is minimal by NISMO (average 1.8%). As pointed out in another thread there is other cheaper ways to reduce your track times/make power gains.

Dropping $1800 for small gain is for those who choose to afford it and hopefully sorted everyting else out, and some perhaps for bling.

I'm encouraging tuners and drivers who install these NISMO plenums report back. On real on road experience & dyno data, not claims or hearsay.

As an aside I'm interested in those new after market Midori? Gsensor too. It'd be nice to get the signals through alot faster.

[CruisingFast]

Thanks guys for all the input, you guys have really been awesome in helping clear things up a little. I'm glad I took the time to post this all up and based on this feedback I've put the Tomei Expreme manifolds up for sale... I'm going to send them back at the end of the week if I can't find a buyer.... I guess whatever the loss is on these it will end up being cheaper than replacing something that might brake under the load I'm wanting to push this too.

To answer some of the questions asked before, my tuner has done flex fuel before and knows the Haltech system quite well. As for the leaning on 5th and 6th cylinder he knows about this though I guess if you didn't have to tune for it ie) running richer than it would help tidy up the tune too by not having to pump extra fuel in to compensate for that.

Also re: the head I made a mistake here and left the stock lifters and valves... I have the Tomei Type B cams in there atm... I'm going to raise this with my engine builder too to find out what it would cost to get something that would better match the 2530's.

The other point to mention is the car isn't in pieces at all, its driving about now with the motor as described in the my original post with stock plenum, manifold and pair of HKS GT-SS turbos..... I'm just preparing myself for the switch to E85 flex fuel and have the HKS 2530's coming from Japan and the ID2000's which I'm still saving for.

The final thing to decide then is whether to go 6boost low mount manifold VS porting and port matching the stock one. I've spent so much getting it to where it is now, I don't want to skimp on the manifolds and plenum if there are some benefits to be had in the tuning and performance side of things...... I also don't mind if it takes me another 8 weeks to save up to get this setup to achieve the best results.

[N1GTR]

Maybe we weren't being blunt enough; USE THE STOCK MANIFOLDS!!!! It's not about skimping on parts, honestly. There's so many big dollar builds around here who have the "buy any part regardless of price" attitude but for the reasons Ash mentioned the stock manifolds are proven to be the most reliable available and they work for the HP target.

The cams you have are a great choice, seriously they'll be fine. If you were to go to the higher lift same duration cams you'll need new buckets, machine work and basically that means pulling the head right down and doing a head service at the same time which all up will cost you a lot. So keep what you have there. I took the time to do a back to back test with those cams and posted results on here. For a drop in cam the increase was significant, so you can either take the advice or ignore it but here right now I'm saying to you that the cams you have already will do a good job. If you are going to go huge boost, add valve springs and your head is finished.

[bigmikespec]

Good luck getting real results back from Nismo plenum owners, all you will get is a dyno sheet and seat of pants BS. Need to measure O2 in each runner for any meaningful data.

[R31Nismoid]

The final thing to decide then is whether to go 6boost low mount manifold VS porting and port matching the stock one. I've spent so much getting it to where it is now, I don't want to skimp on the manifolds and plenum if there are some benefits to be had in the tuning and performance side of things...... I also don't mind if it takes me another 8 weeks to save up to get this setup to achieve the best results.

6boost low-mounts are far from a bolt-on affair.

I suggest you start using the search function, most of what you've asked has already been covered in great detail (including the issues with the 6boost GTR low mount manifolds, pictures and all!)

End of the day it's your money.

If you have a budget, and want best bang for your buck - stick with the stock plenum/stock manifolds. More than enough users out there now proving the combination works. By all means drop another $4000 - but for the plenums 1.8% - $2000 is a bit steep.

You'd be better off putting the $2000 towards a stroker in the cost vs gains department as they are simply a waste of money unless you have an endless budget and are chasing every 1% of performance... Which for a street car/application - simply isn't the case.

[CruisingFast]

Fair point on what's been said.. No point in burning coin if the gains are so small. Stock manifolds will stay. I'll just get them ported and port matched to the 2530s.

I'll post up my results when I have them.

[marksuxass]

Havent Tomei revised there expreme manifolds? (welded on the inside now also?).

In regards to the plenums. I was advised to run a nismo plenum by my tuner. He stated that running one would enable the car to be leant on harder, and would also help in "resistance to pre-ignition" whilst tunning.

I to am running much the same setup as you.

[CruisingFast]

Havent Tomei revised there expreme manifolds? (welded on the inside now also?).

In regards to the plenums. I was advised to run a nismo plenum by my tuner. He stated that running one would enable the car to be leant on harder, and would also help in "resistance to pre-ignition" whilst tunning.

I to am running much the same setup as you.

You will have to let me know how you go with your setup. I've literally just finished putting together the parts for my final upgrade... I say final as I'm likely to end up separated from the misses if I continue on with doing what I've done with the car.

I ended up getting a Nismo plenum btw. I returned the Tomei manifolds and got a set of standard manifolds that had been extrude honed and had them and the 2530's port matched and HPC ceramic coated the turbos and manifolds. I also ended up getting the Greddy suction kit and now I'm done... E85 flex fuel setup is booked and should have it back within a month, the motor is pulled first with a full respray in the Aston Martin DB9 Quantum Silver inside and out.

I really hope I get over 400kw atw and anything towards the 450 would be awesome..... all things considered I think I've done everything I can to get every last piece out of my motor, time will tell.

Sorry I couldn't get the 02 sensors for those interested. I will though be putting in EGT sensors on both turbos so will share what I can from the results there. At the very least we should see if the air distribution is even as the temps should be fairly equal if the fuel flows are the same.

Can't wait to get it back... just trying to figure out how I'm going to get United E85 from Warwick to Brisbane. I'm considering hiring a truck and taking some drums then transporting it back. I rang United today, $1.12 a litre. That's a little over $220 per drum.... 320km round trip with truck hire. Now if anyone knows how the feck to get the drums off the truck I'd like to know. I've heard some folk using old tires to bounce them down gently. I really want to tune my car with United though may can the idea as I'm still trying to confirm with United HO that it's definitely coming online in BNE within the next 12 months.

[SS8_Gohan]

so where are you and where is the car getting tuned?

just get a couple jerry cans, say 3,. 1 in front, 2 in passenger footwells, that's 65L say (always can squeeze a little more in) - should be heaps for tuning purposes. And once you've emptied the first one, go and get some 98 to start mixing it down for the rest of the maps.

[CameronBNR32]

I run a stock intake plenum and HKS 2530s on stock exhaust manifolds, just port matched and heat coated.. running E85, 402awkw @ 20psi, and 310awkw at 14psi, and as others have said about the exhaust manifolds being cast they won't crack like stainless manifolds.