New turbos

[NismoS-tune]

I agree with Curtis. I was jus throwing numbers around from past searches I did when I used to have the -5.

Curtis, I'm guessing your boost comes on a little late with this bigger cams maybe? Then again, 28psi is big boost compared to the 22-24 I was thinking haha. I bet it doesn't really feel laggy for the power you make out of 2.6!

[curtisgoodman]

ill check the graph and see what rpm i was at when i hit 22-24 psi... but as to the OP go -5's... seriously... -5's

dyno sheet is in my glove box, car covered and buried in snow... the ink was almost out at RG when they printed it off so i cant read what it say on photobucket image

[mexi193]

-5's are definitely sounding like what i will do
but has any one run fullrace's twin too mount kit it has borgwarner efr 62/58 turbos

http://www.full-race.com/store/efr-turbo-kit/nissan-rb26dett-efr-twin-turbo-kit-1.html

[NismoS-tune]

Yes there are some out there, price for the kit is around $6000 excluding the custom pipes and hoses Needed. There is at least 1 person with it in Canada. The -5s are bolt on at $2200 said and done. I'd consult your budget before considering an expensive kit.
A used set of HKS gt2530 is under $2500 and is faster spooling/higher top end than the -5 due to design changes and wheel cut backs but I wouldn't say they're way better than -5. The -5 are the the cheapest ban for buck twin turbo that can reuse all stock components.

I agree with curtis goodman on this, -5 ftw.

[mexi193]

Sweet thanks for the info man the only reason I asked about the full race set up was because I need to get manifolds and dumps regardless I don't have anything left from my twin turbo set up

[NismoS-tune]

Oh, forgot, the full race kits needs an r33/r34 ps pump/bracket, a deleted and ps reservoir relocated with new hoses.

Pita


IMO the tomei dumps are top notch along with HKS ones. They're manifolds are great but neither are a must. The stock manifolds, intake pipes dump pipes, all fit with -5 or HKS turbos and can still allow 500whp, even with a stock head.

[Dragon Humper]

Should have never parted the T78. If you didn't like your spool either you are still running a MAF based ECU or your tune sucked. Any setup capable of 600+ HP is going to have a fair bit of lag. The only turbos that I have seen that can spool at 2000rpm and make 600whp are the venerable N1s. On race fuel and only 2.6 litres they will spool nearly off idle and make enough power to trap at 134 mph in the quarter. I have never seen any other combo do that. On pump 91, expect much less but still honkin'.



Jon.

[Skym]

N1 turbo's are about as laggy as stock turbo's, around 4000rpm for full boost on pump gas. Can drop that 400-500rpm or maybe more by dialing in the cam timing with stock or aftermarket cams. Probably more with adjustable internal wastegates, electronic boost controller, E85, tune to suit.

[Dragon Humper]

4000rpm?!?! Yikes man, that's crap. I hate to beat that drum again but I am all in at 5000rpm. I have seen N1s all in at just over 3200 and start spooling at 2000. As I have said before, the tune is GOD, and a MAP reference is mandatory for quick spool early on. Lots of ignition timing is needed right up to that transition point at about 3-4psi, you just can't get that kind of precision with a pure MAF system. You can get close but you will never have it perfect in all transitional situations.

Hell, even steel wheeled stock turbos can get you pretty damn close to your goal as long as you run good fuel and take care of the exess amount of heat that will be created.



Jon.

[Skym]

Do you have a dyno graph, specs of engine, fuel used, etc (not saying your wrong, just curious)???? Wouldn't be a internet debate without them.

From what I have seen on dyno graphs, 4000rpm for peak boost is normal for a RB26 engine, smallish turbo's (around N1 size), producing up to 600whp (unless it has a RB30 that might change that) on pump gas. It has alot to do with camtiming (set for more peak hp), ECU tune (like you said), etc. If has HKS Vcam, E85, RB30 or RB28, etc, might believe that it could spool turbo up earlier. Even GTSS struggles to get close to 480whp on pump gas with RB26 and reaches full boost at around 4000rpm. Probably possible on E85 gas, as can get around 50-100hp more than running on pump gas (turbo hp rating is rated when running on pump gas).

[Dragon Humper]

You should be quite familiar with this car.....

http://www.youtube.com/watch?v=TPPUMoDmWlk

and an update.....

http://www.youtube.com/watch?v=dHl13DTSw64

With the little cams they are running (a reason I am hesitant to change up my cams for something bigger), the gigantic intercooler and exhaust the turbos are starting to spool at 2000rpm and hit a huge target at 4000rpm. There in lies the confusion of turbo target boost and usable transitional boost. 1.7 bar is a big target to hit, but 1 bar is in at an easy 3200 rpm. You can still make alot of hay at only 1 bar. Race fuel is a must, like I said before, pump fuel will take alot of wind out of the sails. Even so, you can cap the boost at 1.2bar and really maximize the tune at that level and you will still make at least 500whp (well, here anyway, we are blessed with really good pump fuel).

I was even mistaken on the trap speed, it was a whopping 137 mph....that's effing hauling on little bitty turbos like the N1s. They even admit in the second vid that the N1s would fall off above 7000 rpm (which makes sense if they are a little undersized) so they changed up to 2860s (iirc).

Dynos say one thing but the trap speed in the quarter has the final word....those guys were making at least 650whp and 600lbft to get a 2800lb car to go that fast. Freaking awesome......





Jon.

[Skym]

Ah, thank you for sharing that info. That makes more sense.