Using Nitrous to spool large turbos early, dyno graphs?

[tuRBy]

Has anyone got any info on using Nitrous to spool large turbos at low rpm when using W.O.T.
I want to see how it affects the area under the curve, in 50 shot, 100 shot 150+ etc

some dyno graphs would be great, with info on nitrous kit used.

I can't find any nitrous before and after dyno charts to compare with, on a quick-ish search, if you know of some can you point me in the right direction.

RB26/27/28/29/30/31

cheers

[Richf]

Rob from RIPS posted this one which demonstrates things well.

This is a single wet stage IIRC 80hp , probably NOS kit .

Not many people bother dyno'ing nitrous hits and even fewer tuners ever post a dyno sheet to show people the effect, yet again fair play to Rob.

IME you dont need big hits to spool the turbo up quickly

[SteveN]

So what am I looking at here, RED lines are nitrous on, blue lines, nitrous off?

[tuRBy]

so it comes in 1250rpm~ earlier, not bad for 80shot.

thats a late spooling turbo for a rb30(?) is it a gt42 or gt45 do you know?

[kismetcapitan]

interesting! A 50 or 75 shot, programmed to run up until 4500rpm (then shut off) could really eliminate lag!

[Lith]

Originally Posted by tuRBy

so it comes in 1250rpm~ earlier, not bad for 80shot.

thats a late spooling turbo for a rb30(?) is it a gt42 or gt45 do you know?

Looks quite similar to the power curve of a car I know running large twins.

[R.I.P.S NZ]

You can see from that, that the point of the NOS is not to neccessarily to make more power as some poeple think, its all about getting torque in as early as possible.

I 'think' IIRC that is a very early graph of the 240z with a very lazy torque converter.

I have another graph somewhere where we had 160whp by 3800rpm with 8 psi boost then with a 75 shot we had 510whp by 3800rpm with 30psi boost.

Had alot of this strange smoke comming from the tyres on the rollers after that, never did work out why

Rob

[kismetcapitan]

I guess what's really needed is a single wet fogger that can shut off like a switch once it hits its "redline". If it doesn't turn off, there could be slight problems - NOS makes me nervous!

[Richf]

Originally Posted by kismetcapitan

I guess what's really needed is a single wet fogger that can shut off like a switch once it hits its "redline". If it doesn't turn off, there could be slight problems - NOS makes me nervous!

Yes you can fit a window switch and have the nitrous operate through a set rpm "window". MSD do them they arent expensive around $75 or some high end nitrous controllers incorporate them

I use a Bee R limiter when on nitrous, but its not unheard of for solenoids to stick open and nitrous and rev limiters dont get on.

I use 25hp jets in my nos system for spool up purposes and extra cooling on the road , I up that to 45hp on the strip but i'm getting boost creep due to my turbo restricting exhaust flow so cant put any more in, still for a stock engined GTST with a reworked stock tubbie it'll run 12/s in full street trim

[tuRBy]

if you find the graph rob I would be very interested to see it. or a T51r graph.

what would you reccomend, a single fogger at plenum entrance or x6direct port, something like a 60 or 80 [wet?] shot should be sufficient going on the above graph. I will use a progressive controller with it, and probably wizards of NOS, apparently their parts are much better quality and reliability than NOS usa brand and Zex.

Originally Posted by R.I.P.S NZ

You can see from that, that the point of the NOS is not to neccessarily to make more power as some poeple think, its all about getting torque in as early as possible.

I 'think' IIRC that is a very early graph of the 240z with a very lazy torque converter.

I have another graph somewhere where we had 160whp by 3800rpm with 8 psi boost then with a 75 shot we had 510whp by 3800rpm with 30psi boost.

Had alot of this strange smoke comming from the tyres on the rollers after that, never did work out why

Rob

[kismetcapitan]

Since I have removed the intake air temp sensor (and moved it to the intercooler, where it can actually measure real air temp and not how hot the engine bay is), I've got that bung sitting there doing nothing...wouldn't it be nice to stick a fogger in there

I would consider it but I think the location is too close to the #1 cylinder and it wouldn't distribute enough to all cylinders equally.

one fogger per cylinder is the ideal situation. It is also far more complicated and, for NOS shots under 100, fairly pointless as well. But six foggers is the way to guarantee that you get equal nitrous and fuel to each cylinder.

[R.I.P.S NZ]

Originally Posted by tuRBy

if you find the graph rob I would be very interested to see it. or a T51r graph.

what would you reccomend, a single fogger at plenum entrance or x6direct port, something like a 60 or 80 [wet?] shot should be sufficient going on the above graph. I will use a progressive controller with it, and probably wizards of NOS, apparently their parts are much better quality and reliability than NOS usa brand and Zex.

I'm 99% sure the above graph is a T51 but as i say, with a very lazy converter.

We always use a single fogger just before the TB and although we have 6 port kits on some motors we have always made enough power without them and they have never been used.

IMO progressive is a waste of time for a small shot and I won't even comment on WON kits compared to NOS or ZEX etc, its not worth the drama, do your own homework, be carefull, make your own decisions but be aware, all is not always as it seems.

Nitrous is so simple its not funny when you follow some basic rules, most people don't and wonder why they have trouble.

Rob

[Richf]

Originally Posted by R.I.P.S NZ

IMO progressive is a waste of time for a small shot and I won't even comment on WON kits compared to NOS or ZEX etc, its not worth the drama, do your own homework, be carefull, make your own decisions but be aware, all is not always as it seems.

Nitrous is so simple its not funny when you follow some basic rules, most people don't and wonder why they have trouble.

Rob

aint that the truth

Equal distribution from a single injector near the TB can be an issue , i personally wouldnt run more than 75hp jets like that (the margin for error becomes narrower the more nitrous you use) and with an hit of that amount a progressive probably isnt needed on a GTR, on my GTS however it was all a bit urgent when the gas came in

[kismetcapitan]

so Rob, you think it's safe to inject into the plenum where the temp sensor bung is located? Or should I inject earlier? I'm thinking a 50 shot just to get things rocking a few hundred RPM sooner.

[tuRBy]

thanks for all the info - its definately got me interested now,