Going single from twins

[allstaruk]

Right, I am considering going singe, i have done most of the supporting mods, what I\'d like to know is how well does a single turbo work with a stock engine, I will port it when it goes but for the time being I don\'t want to have to.

Also what turbo\'s are gonna work best with a stock engine, I\'m making 300 rwhp at the moment on twins

Alan

[shaunwil]

I\'m running a A-spec GT3574 with a 0.84A/R. Making a little bit more than what I acheived with the twins with plenty more to come. I\'m running a stock ported motor and it is seriously smooth and quick. Works out at 325bhp at the hubs at 0.94. Good Spool is about 3 - 3.5k rpm for 0.90 bar. Engine bay is very sparse in comparsion and you get rid of a great deal of the issues with the stock twin.

A conversion isn\'t cheap. You could easily add 1k to the cost of a kit in the bits they don\'t add in even if you do all the work yourself.

I\'m still learning to like it. Yes it is quick, very quick but the smoothness just makes it mask the sheer grunt. Definitely a good idea for a track car where there isn\'t a super snap when it comes into boost.

Would highly recommend one for sure

Shaun

[gmogle]

How much was the kit Shaun if you dont mind me asking ? Also is it the
a-spec in the US ? My folks were out there and popped in, they gave them a tour of the place and were very friendly to them !!!

[allstaruk]

Right, that sounds good what isn\'t cheap though, what would I need to add in?

[nikp]

It is still quite different to the twins though. The twins definately build boost earlier on, so you have to work the engine slightly harder on a single setup. Whereas you could boot it very low down the rev range on a twin setup, you have to think about your gear selection a bit more due to the power being high up in the rev range.

There is a lot to be said for the twin turbo setup!

[michaelb]

Hi

I have always wondered if a decent twin set up like mine producing around 350BHP is more fun as a street car then a 400BHP or just over on a single turbo set up.  I have my 0.92 boost ready to come in any time really but a single turbo you are taking about 4k RPM and above. Here in London you would need a drag strip to really benefit form a single turbo I think but I could be completely wrong.  I have never driven a single turbo and I am in a process of buying an additional RX7 to what I have ATM

Regards,
Michaelb

[shaunwil]

I bought it on a Christmas special. Worked out about £2100 with postage and Duty. Had the manifold coated and some extras to enable me to plumb the wastegate back into the downpipe. I then had the turbo and downpipe ceramic coated over here, had to swap to a smaller wastegate spring (partly due to fueling). You would need a blow off valve, a boost controller, new hard pipes, decent size intercooler, decent size rad (I still have stock) and good amount of fueling. I\'ve also got a ignition amp, racing plugs, uprated clutch, diff brace etc (list goes on)

I\'d love to do a drag against a twin without anybody building boost on the line to see just what the difference really is. The small single turbo is super smooth and very deceptive.

[Dr-Rotor]

LoL I can tell you the difference. My 470whp VS my friends full bolt on TT that I had just finished tuning to 15psi 325rwhp. Both cars on 15psi with a passanger each from a standing start. whp difference is 145whp
 
We both launch hard, window open all I hear is wheel spin. Im straight spining hes sideways. Its even as we both spin through 1st gear, we hook 2nd & again we both spin then gain traction, His bumper is at the rear of my door, we hook 3rd & its still even the road is starting to come to an end. 3rd is moving through the rev range & I start to pull away. we shut down & run again the other way. He launched to hard & I left him behind.
 
TT FDs are faarken quick down low. Once max power & Tq are reached in the higher revs & gears the extra 145whp & Tq on the single starts to pull away. He would not race me on the high way. Stay tuned for the vid of me VS my brothers T61 Supra..when it gets out of the shop.
 
As you asked before about around town driving with a single, yes you need to drop gears for that out right power band but with the right turbo its very very fun & much less hassle than TT maintanance. We own 2 FD\'s. My girl friends FD is TT with 290rwhp & 13psi. We drive it often but Id much rather drive my car on its street tune. Yes I need the lower gears to keep in the power band of the turbo but hell its faarken insane when you step on it. I use a Garret GT3582R with 1.06AR. It spools from 2k & cracks full boost at 4k very very quickly thanks to the light weight flywheel & ball bearings. Boost setting dose not matter 15 or 20 psi it still gets there very quickley & dose not stop pulling all the way to 8k. I would not go back to TT as the single suites my driving style.

[shaunwil]

Is that with a stock porting though ? Don\'t get me wrong the single is for sure a lot of fun and does seem to drink way less juice off boost than the twins (don\'t jump into full boost as fast). The sheer early grunt of a well setup twin is alot of fun. The sheer grunt of a single on song is awe inspiring.

Shaun

[nikp]

LoL I can tell you the difference. My 470whp... I use a Garret GT3582R with 1.06AR. It spools from 2k & cracks full boost at 4k

don\'t spose you do the mapping on the datalogit fc? If so, don\'t spose you fancy sharing your map for me to have a gander at?

[Dr-Rotor]

Sure do. Iv done about 10 TT FD\'s so far. I have a few maps. I did not tune my FD as I was not clued up on the tuning back then. The creator of FC-Datalogit himself MR Steve Rossan tuned my monster for me. Soon after that I began tuning the Apexi cars for my Rotary mechanic RX7HEAVEN. He builds some monster rotary engines.
 
Im still yet to post some pics of the work shop & the nasty PP single turbo he just recently did.
 
I take it your looking for a TT map? I tune differently to Steve. He sets the AFR map all on 1 & tuned from the base map. I leave the base map as is & tune via the AFR & timing maps.
 
I will email you the TT map of the FD that I raced if you like? Just give me your email.
 
O and to answer the other guys question, NO the cars are both on Extended port motors. I still get great fuel milage from my car. 450km around town & 600km on the open road.

[Dr-Rotor]

don\'t spose you do the mapping on the datalogit fc? If so, don\'t spose you fancy sharing your map for me to have a gander at?

 
You after my GT3582R map?

[nikp]

Maybe Just as a learning tool really. I am trying to learn to map, so the more exposure i get, the better

[FD3SNuttah]

you could buy some BNR\'s for the less / about the cost of a single, and get all the benefits of a twin setup and the power of a good single.

[Dr-Rotor]

Maybe Just as a learning tool really. I am trying to learn to map, so the more exposure i get, the better

Yea sure...I dont mind at all. Email me.
bmlove777@hotmail.com