Right - this is the 3rd time I\'ve had an RX7 on the horizon !!
I\'m changing job early next year and new company will eventually want me to have a newer car, currently running a 300bhp (fly wheel) 1997 Impreza that is a lot of fun. 0 - 60 5s
So I suspect I\'ll end up with a boring-mobile and then I\'ll have to have a toy.
My inital thoughs for an RX7 where way off the mark, but I think I\'ve been put right by you guys.
I want a car that will be quicker than my current one, so 350bhp+ at flywheel ?? I don\'t mind DIY maintenance, but I think I\'d like most of the modifcation already done - probably cheaper that way too. Also it\'s going t be a roadcar so I don\'t want a huge turbo with massive power and nothing low down
So here are my current thoughts...
Single turbo convertion
Street port
Cooling, Fueling & ECU to suit above
Can you acheive 350+bhp flywheel on stock twins if one turns up when I\'m in the market?
What single turbo options are there? The smallest suitable for power required would be best I guess.
What budget should I be look at for this and what else should I be considering?
Thanks again - this time I should be actually be joining the ranks. I saw a red ex-Guernsey car for sale a few weeks ago - I think this was the very first one I saw when it was brand new - and i\'ve wanted one since then !!
Thanks in advance again
IMO a rex with 300bhp will be quicker than an impreza with 300bhp, so i dont think you will need to go too high in the power stakes. A nicely sorted rex on twins will pull and pull from 2500 to 7000 rpm. I\'m running twins with uprated boost (14psi) and it is more than quick enough for me. You\'ll be looking at about 5-6k for a sorted one, if you are set on a single tubby i would look to spend upto 9k for a really good example. Just make sure it has a good strong engine.
Really all depends on your budget bud,
If you have the budget to buy a single turbo rx7 now then thats the better bet as in the long run if you want to convert to single turbo in the future it will cost much more than simply buying a converted one already.
Have a look around as lots of decent RX\'s on the market right now, and a completely different car to drive than a Impreza :Laugh
Gurj
If you went non-sequential on the twins you\'d get more power, 350 at the fly is certainly possible with the stock twins as long as you have the right cooling, fueling and boost control, especially if you are thinking of a ported example.
Smaller singles? maybe a GT35R or similar, T04E, T04S
Thing is if you want reasonable power without masses of lag keep the twin setup, IMO, there is no point in have a small to medium sized single - most go single for outright power that means bigger turbos and more lag low down.
Thanks Bobbit, but I don\'t want \'just a bit quicker\' :)
Do you have a street port? and do you know what sort of figures you have?
I understand big power generally means more fragile and higher running costs, so I certainly don\'t want to go through the roof, the car should be a joy not a pain after all.
I know it\'s going to be a very different car but the mods on my Impreza have been to keep plenty of torque low down. I won\'t be (hopefully) town driving too much in the RX7 but I wouldn\'t want it to be a mare if I need to.
£6K deffinately doable, £10K a possibility - where there\'s a will.... :Laugh
Quote from: ClintukThanks Bobbit, but I don\'t want \'just a bit quicker\' :)
Do you have a street port? and do you know what sort of figures you have?
I understand big power generally means more fragile and higher running costs, so I certainly don\'t want to go through the roof, the car should be a joy not a pain after all.
I know it\'s going to be a very different car but the mods on my Impreza have been to keep plenty of torque low down. I won\'t be (hopefully) town driving too much in the RX7 but I wouldn\'t want it to be a mare if I need to.
£6K deffinately doable, £10K a possibility - where there\'s a will.... :Laugh
For 10K you will deffo get a very decent rx mate,with decent mods and decent power, without trying to push my car have a look :
http://www.pistonheads.com/sales/254432.htm
Hi
I am also running stock twins but my boost is up to 0.94 bar, full de cat. The car is very fast IMO, had a run with 3 year old Scooby form standstill and pass it by 4 car lengths by 3rd gear ( had a chat after words, he was running 300BHP) My car is close to 350BHP…
As bobbit said 300BHP on al light RX is a lot of power…
My car is a daily driver and having twin turbo is a lot of fun with out any turbo lag..
Regards,
Michaelb
Hi Michael
To be fair I\'d pass a new Impreza with 300bhp although perhaps not by 4 car lengths - they are at least 150Kg heavier than mine that\'s one of the reasons I\'m not too keen to simply get a newer Scooby.
Thanks Sadgoth, now I\'m thinking non sequential twins and supporting mods now rather than a single would be the way to go for me.
Any ideas of figures for non sequential stock twins on a street port?
Also does the non sequential mod get rid of the \'rats nest\'? and the associated fault finding problems etc...
I\'ve only driven one RX7 and it broke traction on a greasy slip road in a straght line, simply when the 2nd turbo kicked in. I know these cars can bite and coming from the relative safety of 4x4 I know I\'ll need to take care, tey are pretty cars and don\'t deserve being bent.
Quote from: ClintukThanks Sadgoth, now I\'m thinking non sequential twins and supporting mods now rather than a single would be the way to go for me.
Any ideas of figures for non sequential stock twins on a street port?
Also does the non sequential mod get rid of the \'rats nest\'? and the associated fault finding problems etc...
Not sure on the power as not many people have have done it compared to the big single conversion, but your target of 350 is easily achievable, i\'d say closer to 375 with supporting mods.
Big advantage is getting rid of the rats nest! :chat
Complicated this job isnt it !!
I learned the hardway on Impreza, got the year with the small brakes, non reprogramable ECU, pre face lift interior etc - grizzle grizzle.
Trying to avoid similar learning curve with RX7s.
Thanks for help
personally if i were you id go single turbo route ....
more scope for power and if you get a small/meduim sized turbo with street port you wont have much lag
Not sure why going non-sequential would give you more power!? The top end power is when both turbos are engaged in either configuration.
Stock twins on an unported engine can be up to 400 fwhp with all the right mods (mine\'s 380fwhp). If you want big power, buy a converted big single straight off, you will save 1000s in the long run, I kind of wish I had, but then again, it is nice to personalise it along the way
Nice reply Andy
Your output level of 380 at the fly wheel would hit the mark for me. What\'s your set up or is it a secret?
I think the non sequential turbos are slightly modified when it\'s said they give more power top end. I have no idea, but perhaps the non sequntial mod allows for better exhaust flow top end, I presume there\'s a valve that gets thrown away when non sequential mod is done, giving a less restrictive exhaust path?
Do you know by driving a \'small / medium\' single turbo car, how yours compairs, with low rev range and through gears drivability?
Thanks - it\'s all good learning.
Quote from: ClintukYour output level of 380 at the fly wheel would hit the mark for me. What\'s your set up or is it a secret?
No secret, it went something like this thanks to RE:Worx:
[LIST=1]
- Blitz twin induction kit, hard pipes, unsilenced de-cat pipe, Blitz Nur-Spec backbox, ally AST and Apexi PFC ecu = 280rwhp @ 0.8 bar
- 850 primaries, fuel pressure regulator, Supra fuel pump, SMB 3.5 to 3 inch downpipe and SMB twin 3 inch backbox = 302rwhp @ 0.9 bar but spark no good so stayed at 0.8 bar.
- RE:Worx v-mount, HKS twin spark, uprated leads = 319rwhp @ 0.9 bar
Other ways to get the similar result on stock twins would be to port the engine (but then you may as well go single at the same time IMHO) or water injection (a la sdminus)...but I\'m a hands-off person so I only bluff at this stuff :Yawn
QuoteI think the non sequential turbos are slightly modified when it\'s said they give more power top end. I have no idea, but perhaps the non sequntial mod allows for better exhaust flow top end, I presume there\'s a valve that gets thrown away when non sequential mod is done, giving a less restrictive exhaust path?
No, not really. Once the turbos are at full WOT there is no difference in the intake path between the two set-ups. Have a look at this thread
http://www.mazdarotaryclub.com/forums/showthread.php?t=43755&highlight=sequential (http://www.mazdarotaryclub.com/forums/showthread.php?t=43755&highlight=sequential).
QuoteDo you know by driving a \'small / medium\' single turbo car, how yours compairs, with low rev range and through gears drivability?
No. I can\'t speak for the small single cars. On the road I have overtaken a big single while they were waiting for it to spool up :D
(http://www.mazdarotaryclub.com/forums/showthread.php?t=43755&highlight=sequential)