My mechanical preturbo water injection

dudemaaan · 10-07-2009, 04:46 PM

I'm running an HKS twin power with stock coils, 10 mm wires, and greddy race plugs (rebadged ngk 7420's) heat range 10.

If I was redoing the ignition from stock I would go with a Crane Hi6 and LX92 on each leading plug, and stock coils for the trailing. The twin power does work very well for my needs so I won't be changing it out anytime soon.

I haven't been on a dyno yet but I expect over 500 RWHP. If I was to guess I would say 530 or so, maybe more. I also have a very large street port so that will play a big roll in what you can expect. There's another guy on ausrotary with a similar setup to yours, gt45 on a 13 bt extended port, he made 530 on a street tune and then made 550 after dyno tuning, this was at 25psi. He's going back soon and trying to break 600 with 30 psi.

drewrey2004 · 10-07-2009, 06:03 PM

Well as far as ignition I will be running the accel 300+ ignition boxes with the stock coils for now and next on the list are the greddy plugs. The ignition on the car now is factory and I know it won't keep up with the boost and water combo as the car feels kind of sluggish up top on boost at say 15psi. My logged IAT is around 200 deg. farenheit and that's running the coolingmist kit. Not happy with it right now. I want to at least break the 11's in the quarter with at least 400-450 hp.

dudemaaan · 10-07-2009, 06:45 PM

What ecu are you running and how much water with the cooling mist kit? And yes those IAT's are outrageous. Dangerous even. What do you have for an intercooler?

drewrey2004 · 10-07-2009, 06:53 PM

I'm running the Megasquirt Ecu and I had the coolinmist almost maxed out on the progressive controller. As far as intercooler this is a 1st gen rx7 so no intercooler just straight from turbo to throttlebody.

dudemaaan · 10-07-2009, 06:56 PM

Oh thats why your temps are so high. I would try to find room for an intercooler or plan on running meth, either straight or in a mix. You might be able to get the temps down more with enough water, but it's going to take a lot. What size jet comes with the cooling mist?

drewrey2004 · 10-07-2009, 06:56 PM

and also I was able to bring the IAT down to about 185 deg.F but still not happy with it and that was only one time.

drewrey2004 · 10-07-2009, 07:02 PM

the intercooler is a no go. I'm on a tight budget and no job at the moment. as far as the jet I think the kit comes with a 350cc and a 550cc. I have a 550cc post turbo.

dudemaaan · 10-07-2009, 07:07 PM

I'm running a cheap ebay core 24 x 14 x 3 it works extremely well. I think I did the whole intercooler and piping for under $300. You're going to be fighting those air temps with water only, especially if you want to run some big boost through it. Preturbo should help but I don't know how much. Ideally you want your intake temps closer to 120* F or lower.

If it was me I would probably start with about 1000 cc preturbo jet starting with 30/70 meth water then 50/50 if I needed more. If that still wasnt enough I would go up in jet size.

proz07 · 10-07-2009, 08:04 PM

dudemaaan have you ever had an issue with the water recondensing post turbo in the intercooler or am i worried about a moot issue for the pre-turbo water inj?

z

dudemaaan · 10-07-2009, 09:00 PM

Na, there is so much airflow any water that condenses back in the intercooler is going to be pushed right on through to the engine where it can work it's real magic. Whatever is happening in the intercooler works, and as a whole system it works very very well.

drewrey2004 · 10-07-2009, 10:43 PM

the whole setup for under 300 now I can work with that. I will definitely look into that. What kind of piping are you using? I need it as cheap as possible for right now.

dudemaaan · 10-07-2009, 10:46 PM

Just universal aluminum piping 2 1/2". I welded them all myself and saved money that way. Make sure to get T bolt clamps to hold the couplers in place, regular hose clamps suck. Pick the most direct route to reduce bends and increase response.

drewrey2004 · 10-07-2009, 10:50 PM

Wow I don't know if I can weld aluminum with just my 120V mig welder. I'll look into it but I'm looking at intercoolers now and they are pretty cheap. They're going for $129.

drewrey2004 · 10-07-2009, 11:06 PM

Ok well for about $250 I can get 24x12x3 with a total length of 30.5" intercooler and 3" universal piping with T-bolt clamps and boots. My concern is the welding. Is it possible to weld aluminum with my MIG welder?

dudemaaan · 10-07-2009, 11:26 PM

Yes, thats what I used, you will need aluminum wire, and argon shielding gas. It will take some practice but it's easy once you have it all setup. Don't even try without the gas, you will fail. Or you can take it somewhere and have it welded.

10-07-2009, 04:46 PM	#31
dudemaaan Rotary Fanatic Join Date: Mar 2008 Location: Brenham, TX iTrader: (4) Posts: 335 Rep Power: 17	I'm running an HKS twin power with stock coils, 10 mm wires, and greddy race plugs (rebadged ngk 7420's) heat range 10. If I was redoing the ignition from stock I would go with a Crane Hi6 and LX92 on each leading plug, and stock coils for the trailing. The twin power does work very well for my needs so I won't be changing it out anytime soon. I haven't been on a dyno yet but I expect over 500 RWHP. If I was to guess I would say 530 or so, maybe more. I also have a very large street port so that will play a big roll in what you can expect. There's another guy on ausrotary with a similar setup to yours, gt45 on a 13 bt extended port, he made 530 on a street tune and then made 550 after dyno tuning, this was at 25psi. He's going back soon and trying to break 600 with 30 psi. __________________ 500+ HP thanks to: Fast reacting IAT sensor thread! Mechanical Pre-turbo Water Injection Thread Dual Stock fuel pumps Thread T2 differential swap!

10-07-2009, 06:45 PM	#33
dudemaaan Rotary Fanatic Join Date: Mar 2008 Location: Brenham, TX iTrader: (4) Posts: 335 Rep Power: 17	What ecu are you running and how much water with the cooling mist kit? And yes those IAT's are outrageous. Dangerous even. What do you have for an intercooler? __________________ 500+ HP thanks to: Fast reacting IAT sensor thread! Mechanical Pre-turbo Water Injection Thread Dual Stock fuel pumps Thread T2 differential swap!

10-07-2009, 06:56 PM	#35
dudemaaan Rotary Fanatic Join Date: Mar 2008 Location: Brenham, TX iTrader: (4) Posts: 335 Rep Power: 17	Oh thats why your temps are so high. I would try to find room for an intercooler or plan on running meth, either straight or in a mix. You might be able to get the temps down more with enough water, but it's going to take a lot. What size jet comes with the cooling mist? __________________ 500+ HP thanks to: Fast reacting IAT sensor thread! Mechanical Pre-turbo Water Injection Thread Dual Stock fuel pumps Thread T2 differential swap!

10-07-2009, 07:07 PM	#38
dudemaaan Rotary Fanatic Join Date: Mar 2008 Location: Brenham, TX iTrader: (4) Posts: 335 Rep Power: 17	I'm running a cheap ebay core 24 x 14 x 3 it works extremely well. I think I did the whole intercooler and piping for under $300. You're going to be fighting those air temps with water only, especially if you want to run some big boost through it. Preturbo should help but I don't know how much. Ideally you want your intake temps closer to 120* F or lower. If it was me I would probably start with about 1000 cc preturbo jet starting with 30/70 meth water then 50/50 if I needed more. If that still wasnt enough I would go up in jet size. __________________ 500+ HP thanks to: Fast reacting IAT sensor thread! Mechanical Pre-turbo Water Injection Thread Dual Stock fuel pumps Thread T2 differential swap! Last edited by dudemaaan; 10-07-2009 at 07:11 PM..

10-07-2009, 09:00 PM	#40
dudemaaan Rotary Fanatic Join Date: Mar 2008 Location: Brenham, TX iTrader: (4) Posts: 335 Rep Power: 17	Na, there is so much airflow any water that condenses back in the intercooler is going to be pushed right on through to the engine where it can work it's real magic. Whatever is happening in the intercooler works, and as a whole system it works very very well. __________________ 500+ HP thanks to: Fast reacting IAT sensor thread! Mechanical Pre-turbo Water Injection Thread Dual Stock fuel pumps Thread T2 differential swap!

10-07-2009, 06:03 PM	#32
drewrey2004 The Newbie Join Date: Oct 2009 iTrader: (0) Posts: 15 Rep Power: 0	Well as far as ignition I will be running the accel 300+ ignition boxes with the stock coils for now and next on the list are the greddy plugs. The ignition on the car now is factory and I know it won't keep up with the boost and water combo as the car feels kind of sluggish up top on boost at say 15psi. My logged IAT is around 200 deg. farenheit and that's running the coolingmist kit. Not happy with it right now. I want to at least break the 11's in the quarter with at least 400-450 hp.

10-07-2009, 06:53 PM	#34
drewrey2004 The Newbie Join Date: Oct 2009 iTrader: (0) Posts: 15 Rep Power: 0	I'm running the Megasquirt Ecu and I had the coolinmist almost maxed out on the progressive controller. As far as intercooler this is a 1st gen rx7 so no intercooler just straight from turbo to throttlebody.

10-07-2009, 07:02 PM	#37
drewrey2004 The Newbie Join Date: Oct 2009 iTrader: (0) Posts: 15 Rep Power: 0	the intercooler is a no go. I'm on a tight budget and no job at the moment. as far as the jet I think the kit comes with a 350cc and a 550cc. I have a 550cc post turbo.

10-07-2009, 08:04 PM	#39
proz07 Needing a new tow rig. Join Date: Mar 2008 Location: AR iTrader: (0) Posts: 245 Rep Power: 17	dudemaaan have you ever had an issue with the water recondensing post turbo in the intercooler or am i worried about a moot issue for the pre-turbo water inj? z

10-07-2009, 10:43 PM	#41
drewrey2004 The Newbie Join Date: Oct 2009 iTrader: (0) Posts: 15 Rep Power: 0	the whole setup for under 300 now I can work with that. I will definitely look into that. What kind of piping are you using? I need it as cheap as possible for right now.

10-07-2009, 10:46 PM	#42
dudemaaan Rotary Fanatic Join Date: Mar 2008 Location: Brenham, TX iTrader: (4) Posts: 335 Rep Power: 17	Just universal aluminum piping 2 1/2". I welded them all myself and saved money that way. Make sure to get T bolt clamps to hold the couplers in place, regular hose clamps suck. Pick the most direct route to reduce bends and increase response. __________________ 500+ HP thanks to: Fast reacting IAT sensor thread! Mechanical Pre-turbo Water Injection Thread Dual Stock fuel pumps Thread T2 differential swap!

10-07-2009, 10:50 PM	#43
drewrey2004 The Newbie Join Date: Oct 2009 iTrader: (0) Posts: 15 Rep Power: 0	Wow I don't know if I can weld aluminum with just my 120V mig welder. I'll look into it but I'm looking at intercoolers now and they are pretty cheap. They're going for $129.

10-07-2009, 11:06 PM	#44
drewrey2004 The Newbie Join Date: Oct 2009 iTrader: (0) Posts: 15 Rep Power: 0	Ok well for about $250 I can get 24x12x3 with a total length of 30.5" intercooler and 3" universal piping with T-bolt clamps and boots. My concern is the welding. Is it possible to weld aluminum with my MIG welder?

10-07-2009, 11:26 PM	#45
dudemaaan Rotary Fanatic Join Date: Mar 2008 Location: Brenham, TX iTrader: (4) Posts: 335 Rep Power: 17	Yes, thats what I used, you will need aluminum wire, and argon shielding gas. It will take some practice but it's easy once you have it all setup. Don't even try without the gas, you will fail. Or you can take it somewhere and have it welded. __________________ 500+ HP thanks to: Fast reacting IAT sensor thread! Mechanical Pre-turbo Water Injection Thread Dual Stock fuel pumps Thread T2 differential swap!