400whp RB20 Build

[MATTs14]

Hey everyone. Just thought id post up my current plans on my RB20 build.

RB20, R32 crossmember and mountsKA driveshaft ( Custom driveshaft before project completion)Garrett GT3071R .63 A/R, Internal gate on stock manifoldCustom dump with Greddy MX 80mm downpipeHKS Hi Power Exhaust 85mmTomei Poncams and Cam gears27x11x3 FMIC with 2.5 in. piping2 12in. cooling fans with DiF Fan controllerSplitfire CoilpacksGreddy ProFec B spec 2ECU remap and Apexi Afc Neo for some fine tuningAEM or other WidebandEGT gauge and other necessary gauges (Water and Oil)550 injectorsWalbro 255

If there is anything ive forgotten or anything i need to add feel free to tell me. Also all input and help would be greatly appreciated

[craz4240]

I do believe with the poncams your gonna have to convert to solid lifters.Procams you do not.

Nice list but don't buy too much off ebay.

[MATTs14]

Yeah i NEVER do ebay lol and i must have gotten the cams mixed up. I dont want to have to convert to solid lifters. I thought the procams were the more aggressive ones though? Either way, all help is appreciated.

[Carl H]

you might want to go with 660's for a true 400whp...at 387whp we calc'ed my old 550 setup to be around 83% duty at 18psi...

[jdmser]

Yeah, I think that's backwards. Some procams need solid lifters and all the poncams are straight drop in.

OP-If your doing a custom dump why spend the money on the Greddy downpipe. Have the whole thing done as one custom piece to the cat.

[onepuff]

Skip the splitfire coils too. Go for the external buick coil retrofit. Been working great for me.

[MATTs14]

Yea after i posted that up I started thinkin that the 550s might be a little small. I considered doing deatschwerks injectors but ive heard mixed reviews on them. And i also think it would probably be cheaper and more efficient to get a whole dump and downpipe in one with a divider or a divorced dump setup. I saw a guy running the msd ignition setup and it looked pretty good. Do these setups yield any noticeable gains or improvement over the splitfires? Thanks again for all the response and help.

[craz4240]

Yeah, I think that's backwards. Some procams need solid lifters and all the poncams are straight drop in.

OP-If your doing a custom dump why spend the money on the Greddy downpipe. Have the whole thing done as one custom piece to the cat.

Wouldn't be the first time I was mistaken but I was pretty certain poncams required lifters.

[Darius]

Yea after i posted that up I started thinkin that the 550s might be a little small. I considered doing deatschwerks injectors but ive heard mixed reviews on them.

The thing with deatschwerks injectors is that you NEED to compensate for the injector lag because the lag curves they experience are wayy different than the stock injectors. I first installed my 650s without changing the lag settings and the engine ran pretty rough and idled like crap (hunted, sputtered off-throttle, etc.) I changed the injector lag settings and it purred like a kitten. Just had to readjust the idle AFR after doing that.

ALL Tomei Poncams for the RB20 are for hydraulic lifters only. The Procams come in both hydraulic and solid lifter applications.http://www.tomei-p.co.jp/_2003....html

[MATTs14]

Well im gonna get Carl H to do a remap. Wouldnt it be corrected in the ecu?Im not real sure but i would assume it would.

[WhatsADSM]

Injector dead time (lag) should be tunable in the ECU. Although it can be quite a bit touchy since you are at such low duty cycle at idle, so honestly it works much better to have it done by a local then the mail in tune... However since you plan to run an SAFC anyways you should be able to fine tune it a bit anyways.

As a side note here are my thoughts:- No clutch listed- Get a good fuel pressure regulator- IMO 550s are fine for 400. But if you plan to push it close to 500 then you will probably want something a little bigger.

[Carl H]

ive tuned all sorts of injectors now...gtr stockers, rc's lucas, my greddy 720's and several deatchwerks sets...

[MATTs14]

Yeah i forgot to list it but ive already got the Nismo FPR on the motor from the last swap. And i think the more tuning i could have done with the ecu and not the AFC then the better cause after all it is just piggy back. And i forgot the clutch, my bad. What do you guys suggest? Ive heard some negative feedback on the spec clutches so i kinda wanna stay away from those. And carl h, could you tune to compensate for the 650 deatschwerks?

[onepuff]

I saw a guy running the msd ignition setup and it looked pretty good. Do these setups yield any noticeable gains or improvement over the splitfires? Thanks again for all the response and help.

No real gains, but i don't think you'll find any major gains with the splitfires for the money you'll be shelling out for them.

[craz4240]

Oh and yes indeed poncams are fine.......I have been dislexic this week what lol

[MATTs14]

How much would the wasted spark setup cost? I found a kit on a website that had it for around 200 if i remember correctly.

[onepuff]

$100-150 depending on what kind of coils and wires you use.

[MATTs14]

I saw a guy on here who had a nice setup with msd coils and wires. It was on a gold motor, i cant remember if it was on a 25 or 26. It was nice though. Any more suggestions or anything to add to the list?

[nismo_gts4]

All that will give u 400hp, it just depends on how long the motor will handle it with stock internals. If you put aftermarkets rods and pistons in you can get some good hp since it has a iron block.

[DeclareYrWar]

All that will give u 400hp, it just depends on how long the motor will handle it with stock internals. If you put aftermarkets rods and pistons in you can get some good hp since it has a iron block.

He does not need to get into the motor that far to run 400 hp safely. Rods are not necesary, the factory ones hold up just fine with some arp hardware. The pistons are the weak point of these motors and even those have been pushed pretty far with good tuning.

If you're going to post replies to peoples questions on these forums please make sure your information is accurate.n

[240z4u]

Dude, what lag settings did you use? My car idles kinda dookyish as you mentioned.

The thing with deatschwerks injectors is that you NEED to compensate for the injector lag because the lag curves they experience are wayy different than the stock injectors. I first installed my 650s without changing the lag settings and the engine ran pretty rough and idled like crap (hunted, sputtered off-throttle, etc.) I changed the injector lag settings and it purred like a kitten. Just had to readjust the idle AFR after doing that.

ALL Tomei Poncams for the RB20 are for hydraulic lifters only. The Procams come in both hydraulic and solid lifter applications.http://www.tomei-p.co.jp/_2003....html

[Darius]

Deatschwerks has tested the lag of all their Nissan injectors versus the stock injector lags.

[240z4u]

Freaking awesome, I had no idea that was there. I never put any thought into it.

Evan

[Darius]

I know this is straying quite a bit from the topic, but mine idled like crap without the adjusted lag settings. It idles perfectly now and runs much smoother with the lag adjusted according to Deatsch's numbers.

[240z4u]

Threadjacked as all hell, but it will pop up in search.

Will you please email me with how exactly I calculate the lag change? I would like to put a comprehensive post up here for everyone that searches.

Evan

[l0nestar]

The car with the Gold motor and MSD coils belongs to LargeKid.

If you go with the MSD - LSx coil setup, it will run around $600 I believe (The coils are around $80 each from Summit). Somone just did a write up on them... They did a good job with the install.

[MATTs14]

Back From The DEAD!!!

Well i just thought i would update this a little since the plans have changed a little...well a lot actually

Holset Hx356Boost Forward Facing top mountSynapse 40mm wastegateZ32 MafInnovate LC-1 wideband with DB gaugeGizzmo MS-IBC boost controllerCustom 3.5 inch downpipeCarl H RemapSard 650 or 660(IVe seen both)

I'll still be using the same fuel system with the exception of the sard fprI'll probably be trying to find a way to use a 26 intake manifold which will probably be using the 20 manifold flange welded to the 26

Also i'll be using an xtd stage 3 clutch since it came with the new motor im building. I wont do cams for now but i will in the near future when i build the head i.e. solid lifters, valve springs, 264 cams, all by tomei, and some valves. So let me know what you guys think of the plans.

[Coolwhip]

Also i'll be using an xtd stage 3 clutch since it came with the new motor im building.

Hey Matt, have you seen this? zerothread?id=352686

[MATTs14]

very scary...

I think i'll be adding another clutch to the list since i like my life and my feet. Thanks again coolwhip. Youre a lifesaver. literally lol.

So what type of clutch do you suggest?? My clutch in the car now doesnt feel stock at all. My friend has an rb and its much stiffer than his. Even he says so.

[MATTs14]

Well i was looking on deatschwerks site today and they have 650's for $429 and 750's for $459. The question is is should i go ahead and spend the extra 30 bucks and have plenty of room? Would these be harder to tune or cause worse mileage?