RICESP Water Injected RX7

[RICE RACING]

Originally Posted by Grant M

that is just brilliant.

Yes it is!


I have changed the boost control from automatic to manual setting, and reconfigured a whole heap of settings, this has allowed quick changes in boost settings. The negatives are little v's the ability to not go through a lengthy "learning process" each time you want to try a new setting.

Yesterday after work I took it out and set to 1.92kg/cm boost its flying! just stupid how fast it is really, on the ECU logging it shows 100kmh to 150kmh in 2.05 seconds in 3rd gear, its difficult to look at any gauges in the car minus a quick scan of the tach, but really you change gear by instinct and feel and noise more than looking for a position of the needle ............ it really is that fast. I always have the intention to look at the boost setting or EGT etc, when doing a run in 3rd or higher, but in reality shit is happening so fast, pinned back in seat, car moving around, focused on keeping it on road that none of that is remotely possible. great great fun

[Grant M]

So is that a little over 1.9 bar? Are you looking forward to the dyno comp? Would he good for you to get some responses from people when you tell them that the ports are standard.

[RICE RACING]

Originally Posted by Grant M

So is that a little over 1.9 bar? Are you looking forward to the dyno comp? Would he good for you to get some responses from people when you tell them that the ports are standard.

I'll have it around that level of boost, but you never know what they run on a dyno since I only ever set it up on the road, may be a bit less or a bit more?

I'd like to go to it, last year they would not let me enter!, if they let me in I'll go, if not then no loss to me it's far more important to see/feel how it goes in real life on the road v's a rolling road. Good to go there to show up a few V8's they won't know what's going on lol.

My best estimate is the engine has 540bhp to 560bhp as it is now, what ever this equals on one of the hype roller machines is what I would like to see, as on my honest power recordings it is @ around ~340rwkw (460rwhp) on a std temp and pressure corrected day. Does not sound much in this day and age, especially if you watch some jappo domar video's lol but ironically if you look at how much lighter those cars are and how much more apparent power they have they don't accelerate now where near as good! I remember seeing one Euro time attack RX7 that did 435rwhp (dynodynamics) and weighed 100kg less than my car and it took 8.5 seconds to do 100kmh to 200kmh when my car with only 450bhp @ the engine did it in 7.5 seconds! same gearing lol............. I don't think much of rwhp dyno sheets after doing this for so so many years

[RICE RACING]

With the new WI settings I made end of last year the charge temperature has seen the biggest improvements, even on ~1.9kg/cm on a 23 deg C ambient day the value is around 43 deg C on a 3rd to 4th gear pull. This is unreal given the size of my standard IC in the pics I provided (it is really way to small for this level of power) but the WI and the Spray really have worked amazingly well. The fuel temperature stays really well in check going in at 28 deg C (after a 30 minute drive ^ in above test) so it can do with a lot more boost pressure even in warm ambient temps.

Come winter running time, it will be no issue at all (bar traction!) to run the maximum boost the turbo can achieve, though it is near its overspeed limits now (if you choose to respect those *compressor maps*) I know of lots of people who exceed them, either way the more boost I run the more power the car makes and its not showing sign of diminishing gains. Could probably run it to well over 36psi lol. We will see, I'll pass this durability mark like I have all of the others over the years, and think about that next year

[Grant M]

How is your IC too small? In thickness or physical overall size? I have just got myself a PWR charge cooler with complete kit for ?700. ?500 cheaper than brand new. With the position I am going to mount the rad for the CC the volume of water will never let the CC heat soak. And with the addition of WM injection it should be amazing on inlet temps. And the fact that here in the ukthe weather isn't that hot even in the summer should make it a great setup.

[RICE RACING]

Originally Posted by Grant M

How is your IC too small? In thickness or physical overall size? I have just got myself a PWR charge cooler with complete kit for ?700. ?500 cheaper than brand new. With the position I am going to mount the rad for the CC the volume of water will never let the CC heat soak. And with the addition of WM injection it should be amazing on inlet temps. And the fact that here in the ukthe weather isn't that hot even in the summer should make it a great setup.

Overall size, its limited by the carbon air box and battery position, have to keep it cause of the rare nature of the car

If you run it non WI or spray it gets hot! back when I had it twin turbo and only on about 380bhp @ 1 kg boost it would pull about 70deg C charge temp in the top of 4th gear on a 28 deg C day.

I do dump allot of water on the IC, a trick I picked up of the old Benetton BMW F1 car when I red an article from their engineer who said how much they put over the core per lap in qualifying to keep the charge temps down to 45 deg C.

[Grant M]

This is what iv got coming.
http://www.chargecooler.co.uk/index....roducts_id=205

[Grant M]

Originally Posted by Grant M

How is your IC too small? In thickness or physical overall size? I have just got myself a PWR charge cooler with complete kit for ?700. ?500 cheaper than brand new. With the position I am going to mount the rad for the CC the volume of water will never let the CC heat soak. And with the addition of WM injection it should be amazing on inlet temps. And the fact that here in the ukthe weather isn't that hot even in the summer should make it a great setup.

Originally Posted by RICE RACING

Overall size, its limited by the carbon air box and battery position, have to keep it cause of the rare nature of the car

If you run it non WI or spray it gets hot! back when I had it twin turbo and only on about 380bhp @ 1 kg boost it would pull about 70deg C charge temp in the top of 4th gear on a 28 deg C day.

I do dump allot of water on the IC, a trick I picked up of the old Benetton BMW F1 car when I red an article from their engineer who said how much they put over the core per lap in qualifying to keep the charge temps down to 45 deg C.

Before I swapped to a front mount IC on my FD, the temps were around 60-70C at 1 bar, swapped to huge front mount 3" core IC, temps went down to 24C!! And I gained .05 bar of boost and the car felt so much faster. The water temps dropped 10C too which I was amazed at.

[RICE RACING]

^ Yep been there with my old first gen RX7 decades ago

That is why I feel even more proud achieving (over double the certified measured performance of a stock RX7-SP) what I have with this set up as its really just 100% engine and bolt on's (sans turbo!) stock with fine tuning and the power of water injection unleashing the gains in power and durability

[Grant M]

Have you inspected the inlet turbine at all? To see if there is any pitting or degradation from pre turbo?

A lot of people I speak to about WI are scared of pre turbo because they don't want to brake there turbos, but I explain to them that the elford turbo 1st gen rx7 actually have a preturbo carb, injecting petrol before the inlet. And they had no problems with degradation or cooling as they ran no ICs!!