300WHP Out of an SR20DET Redtop

[nisileighty]

Hi there, I'm new to NICOClub. I recently finished up my redtop SR20DET swap into my 1993 240sx hatch. I have done all supporting mods like a front mount, full straight through turbo back 3" exhaust, tubular manifold, GReddy intakke plenum, 255LPH Walbro, full emissions delete, A/C delete, using NGK BKR7E plugs. I was wondering what other mods and how much boost I would need to get right around 300 RWHP.

Again, I'm new to the forums so please keep the flaming to a minimum. Thanks!

[themadscientist]

Bigger injectors, bigger turbo and a tune.

I am a CA18 guy so I must flame you for going with the soda can motor.

[nisileighty]

Bigger injectors, bigger turbo and a tune.

I am a CA18 guy so I must flame you for going with the soda can motor.

Thanks for the reply. Would a GT2871R be the correct turbo for this setup? And haha those CA's can get pretty quick. What have you done to it?

[themadscientist]

Excellent choice. I was looking at that as a stealth turbo on my FJ20 and it's just as well suited to the soda can. Here's a member's results with one.

dyno-results-tell-me-if-these-numbers-l ... 22456.html

Yeah, the CA is a little wolverine. This dude is posting higher power figures than I have targeted for the RB26 2.8 I have being built for the GT-R, crazy man. My CA18 was significantly less impressive, but we had some wild times and I still have a pile of parts left over.



You have to be a little outside of the box and passionate to go CA18, though. The SR has an infinitely stronger aftermarket support, availability and knowledge base; you done good.

[nisileighty]

Wow! That CA is insane. Although, it is nice to see other Schassis enthusiasts take different routes haha. For my SR, if I were to run around 18 PSI on a GT2871R, stock head and internals though, what numbers would I be making? And a tune, of course. I ask because the SR just doesn't have that pull quite like a VGDETT does you know? I'm trying to build a reliable but fast daily. I feel this has that potential, it's just not quite there yet.

[Lobo240sx]

For my SR, if I were to run around 18 PSI on a GT2871R, stock head and internals though, what numbers would I be making? And a tune, of course. I ask because the SR just doesn't have that pull quite like a VGDETT does you know? I'm trying to build a reliable but fast daily. I feel this has that potential, it's just not quite there yet.

On average dyno session you "should" be making between 275whp-300whp with 2871R, stock cams (this will be your bottleneck), 740CC Injectors with a good standalone tune. VG is a 6 cylinder + Torque monster so there is no comparison with another liter of engine.

The weak parts about these engines are the bearings. I shook my front main bearing out within 3 months of hard 20-22psi pulls. Best to freshen up with forged pistons/rods, balance crank, and ACL bearings. My pistons/cylinder walls were all fine because of a proper tune. At the time wanted to see how long it would last before I broke something. The crank and block are trashed in the front because of all the heat when the bearing let go.... I have a spare redtop block that I plan on someday doing darton sleeves and going at least .20-.40 over according to the machine shop.

So at least go ARP's, Metal Head Gasket to keep the head from lifting blowing your Head Gasket.

[nisileighty]

On average dyno session you "should" be making between 275whp-300whp with 2871R, stock cams (this will be your bottleneck), 740CC Injectors with a good standalone tune. VG is a 6 cylinder + Torque monster so there is no comparison with another liter of engine.

The weak parts about these engines are the bearings. I shook my front main bearing out within 3 months of hard 20-22psi pulls. Best to freshen up with forged pistons/rods, balance crank, and ACL bearings. My pistons/cylinder walls were all fine because of a proper tune. At the time wanted to see how long it would last before I broke something. The crank and block are trashed in the front because of all the heat when the bearing let go.... I have a spare redtop block that I plan on someday doing darton sleeves and going at least .20-.40 over according to the machine shop.

So at least go ARP's, Metal Head Gasket to keep the head from lifting blowing your Head Gasket.

Yeah, I ran 16 psi on a z32 and made 350 foot pounds of torque at the wheels. I plan on lowering my 240 on Tein coils this weekend then taking it to get a dyno... I wanna see what numbers I'm making now, factoring in age and my mods, before I start trying to get the figures higher. I don't expect it to be any less than 180 at the wheels seeing my compression at 155 across all four, but I also don't expect anything above 200 wheel. That being I don't have a tune to account for any of the upgrades. So what turbo do you recommend? Money's tight lol so I'm on a budget. And how much PSI? Thanks.

[Lobo240sx]

Yeah, I ran 16 psi on a z32 and made 350 foot pounds of torque at the wheels. I plan on lowering my 240 on Tein coils this weekend then taking it to get a dyno... I wanna see what numbers I'm making now, factoring in age and my mods, before I start trying to get the figures higher. I don't expect it to be any less than 180 at the wheels seeing my compression at 155 across all four, but I also don't expect anything above 200 wheel. That being I don't have a tune to account for any of the upgrades. So what turbo do you recommend? Money's tight lol so I'm on a budget. And how much PSI? Thanks.

Nice numbers for the Z. You upgrade the turbos or stock twins? Recommended turbos would be a Garrett T28. Stay away from any knock offs. They are garbage. Forced Performance had a nice T28 back in the day, but I don't think they make them anymore. I got tired of blowing T25's and T28's so I moved on to a T3 that was supposed to be used on a 13B RX7.

Upgrading to a T28 on a S13 SR can be tricky sometimes. Some people slapped the turbo on without doing any tuning and were fine on 370CC's. The next person that did it fuel cut and needed bigger injectors with a tune. Recommend that you upgrade to at least 440CC injectors + tune. At that point, you should be fine running anything above 12PSI-18PSI on 93 Octane. I'm feeling ya on money being tight.

[nisileighty]

Nice numbers for the Z. You upgrade the turbos or stock twins?

I stayed with stock T22's and turned the boost up until the stock s*** 370cc's couldn't keep up. At that point I was probably running a little lean to say the least. Rights around 3500 RPM when it reached peak the graph became really squiggly as it leaned out. Not good.

Recommended turbos would be a Garrett T28. Stay away from any knock offs. They are garbage. Forced Performance had a nice T28 back in the day, but I don't think they make them anymore. I got tired of blowing T25's and T28's so I moved on to a T3 that was supposed to be used on a 13B RX7.

Upgrading to a T28 on a S13 SR can be tricky sometimes. Some people slapped the turbo on without doing any tuning and were fine on 370CC's. The next person that did it fuel cut and needed bigger injectors with a tune. Recommend that you upgrade to at least 440CC injectors + tune. At that point, you should be fine running anything above 12PSI-18PSI on 93 Octane. I'm feeling ya on money being tight.

So there's a number of options I can take. An S15 T28, which would be the most reliable for obvious reasons, an S14 T28, or like a twisted motion GT2871R. Since I don't have tons to spend, I think the S15 T28 is out of the question, as I see them going for $900 and such. A few S14 T28's are up on craigslist right now for like $350 so that's a more realistic option. The twisted motion T28 is a kinda grey area for me. I don't think I'm ready to put my motor's safety in the hands of a small time manufacturer that may just rebrand cheap china turbos for all we know lol. So most likely I'll be picking one of the S14 turbos up. Then there's the fuel. I'm wondering if my stock fuel system will even be good for anything over 1 bar (About 14 PSI) because my z32 was lean at 16 PSI. I can either order a set of DW 555's and get a tune, or pick up some FiveO 750's off craigslist. Which do you think is better for about 15-16 PSI? And what ECU should I run? I'm leaning towards an Enthalpy RS.
Thanks!

[nisileighty]

By the way, here's a pic of engine bay and 240sx.

[Lobo240sx]

I stayed with stock T22's and turned the boost up until the stock s*** 370cc's couldn't keep up. At that point I was probably running a little lean to say the least. Rights around 3500 RPM when it reached peak the graph became really squiggly as it leaned out. Not good.



So there's a number of options I can take. An S15 T28, which would be the most reliable for obvious reasons, an S14 T28, or like a twisted motion GT2871R. Since I don't have tons to spend, I think the S15 T28 is out of the question, as I see them going for $900 and such. A few S14 T28's are up on craigslist right now for like $350 so that's a more realistic option. The twisted motion T28 is a kinda grey area for me. I don't think I'm ready to put my motor's safety in the hands of a small time manufacturer that may just rebrand cheap china turbos for all we know lol. So most likely I'll be picking one of the S14 turbos up. Then there's the fuel. I'm wondering if my stock fuel system will even be good for anything over 1 bar (About 14 PSI) because my z32 was lean at 16 PSI. I can either order a set of DW 555's and get a tune, or pick up some FiveO 750's off craigslist. Which do you think is better for about 15-16 PSI? And what ECU should I run? I'm leaning towards an Enthalpy RS.
Thanks!

Enthalpy is good. Check with your tuner to be sure they are able to dyno tune it for you. Honestly when it comes to tuning through experience it's better to spend the extra money on a standalone. I was running the Apexi Power FC with my last tune and it was perfect. When you decide to change your setup, you won't have to worry about reflashing your ECU. Just upgrade and put it on the dyno seems to be a less PITA lol. I'd go with the 740's + tune so when you want more power, you move on to a T3 top mount.

Nice ride and clean engine bay.

[nisileighty]

Enthalpy is good. Check with your tuner to be sure they are able to dyno tune it for you. Honestly when it comes to tuning through experience it's better to spend the extra money on a standalone. I was running the Apexi Power FC with my last tune and it was perfect. When you decide to change your setup, you won't have to worry about reflashing your ECU. Just upgrade and put it on the dyno seems to be a less PITA lol. I'd go with the 740's + tune so when you want more power, you move on to a T3 top mount.

Yeah, after some though, standalone seems like a much better option for an application like mine. My local dyno shop sells the Apexi Power FC for $900... Yikes. So if I installed a boost controller on my SR exactly how it is now, stock 370's, stock T25, how much PSI and what numbers would I be around? I wanna say about 250 WHP but I don't have enough SR experience to know for sure. I'm more of a VG guy Also, a top mount definitely dresses up the bay. Pop the hood and see all the shiny chrome and a fat turbo haha. Maybe later though. I don't think me or my wallet is ready for that yet

Nice ride and clean engine bay.

Thanks man! Put a lot of time and money into it

[Lobo240sx]

T25 numbers vary but 15psi with 93 Octane net you 220 to high 230's whp. Rare you see above 240-250whp but it has happened. I think the dyno was a bit off on those and being friendly lol.

[jamescallowa]

Congratulations you have done a great job!