2860r-5 Or-7

[ISC-Performance]

Yes I have been searching the forums but still after more opinions etc. My supporting mods will be powerfc, 700cc injectors, exhaust, pods,cam gears, walbro fuel pump.

Iam after about 290+ rwkw but the main thing is I want response NO LAG!!! ....The main question is how much more lag will I get with the -5 over the -7 , if its stuff all obviously its in my best interests to go the bigger turbo and add another 30-40rwkw.

2860r-7 = "N1" rated at 320hp

2860r-5 = "very close to 2530" rated at 360hp

Please list your opinions and if you are running these turbs your mods and when they come on boost etc.

Thanks,Ryan

[700HP-GTR33]

To get the best out of the -5's you need Poncams...

This with comp. and tune for street will give you great responce.

You have not done a search....this topic has been discussed 1 billion times..LOL

Don't know what state you are in but if your in Melbourne..I could show you what the package can do...

[R31Nismoid]

You dont "need" poncams for the -5's at all. The top 5 Circuit cars here in Vic (that use -5) dont have poncams, and are leagues ahead of everyone else.

For 290-320rwkw, the -7 is what you want. The -5 (2530 style) are too big for that goal.

Simple as that really.

[Snowman]

I don't see even why you posted this question?

It isn't complicated at all. -7's for mor response (less lag) and -5's for more power (but more lag).

But you seem to already know this.....

Either way your 290rwkw's will be achieved no problems. But you will feel the difference in lag between the 2 set-ups. But you will also feel the difference in power.

[Scooby]

Ok slightly off topic, what do you guys think when paired with a 26/30 DETT. I'm thinking the -5s on the 30 would be similar to the -7s on the 26.

Cheers

[700HP-GTR33]

You dont "need" poncams for the -5's at all. The top 5 Circuit cars here in Vic (that use -5) dont have poncams, and are leagues ahead of everyone else.

For 290-320rwkw, the -7 is what you want. The -5 (2530 style) are too big for that goal.

Simple as that really.

Circuit...correct Ash..not street...who is goint to stay 6 to 8K Rpm on the road..LOL

[rob82]

Ok slightly off topic, what do you guys think when paired with a 26/30 DETT. I'm thinking the -5s on the 30 would be similar to the -7s on the 26.

Cheers

I'm trying to put my engine in this week, 8.7:1 comp RB30/26 with the -5's so I will let you know the results.

[Scooby]

excellent, looking forward the results

[ISC-Performance]

Does anyone have any feedback on the -7 "N1" top end power/response. Dyno graphs would be great just want to no if it starts to die out etc.

Thanks,Ryan

[SLIPPERY]

have a look under the rb26 thread stickied at the top of this section

[R32 TT]

excellent, looking forward the results

Same here - look forward to hearing results. I have a 26/30 running -5's as well. But mine is still a few weeks away before the key gets turned. Fngers crossed its gonna be gooooood.

[R31Nismoid]

Circuit...correct Ash..not street...who is goint to stay 6 to 8K Rpm on the road..LOL

Ye, well change that to street driven circuit.

Make it better? Because they are all registered, and very very fast street cars.

[MAX PSI]

ive run 10.3@139mph using the -5,on a rb26dett,full weighted vl calais 18in street tyres

[rob82]

ive run 10.3@139mph using the -5,on a rb26dett,full weighted vl calais 18in street tyres

Would have to be auto??

[discopotato03]

I think it was WilliamsF1 here that turned his RB26 road engine into a torque mountain with the -7 type turbos which from memory are similar/same as RB26 specific GT-SS turbos . He did a lot of other things as well and I think the result made his RB26 feel more like people today expect a production engine to feel - sort of 2500-3000 and hang on .

I've never driven or even been in a GTR but everyone says that they're just a car until 4000 odd and then things really happen .

If I ever inherited a GTR its what I reckon I'd use . Makes the V8's look even sicker I suppose when the legend starts to haul nearly 1000 revs sooner than they usually do .

Cheers .