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2G What parts are needed to make 400whp reliable on a 7 bolt 4g63?

2g_Shaun

Probationary Member
14
0
Oct 11, 2022
Rio Rancho, New_Mexico
what parts are needed to make 400whp reliable on a 7 bolt? I want to stay stock internals. But if that is not a good idea what is a good number? I have a action clutch 6 puck sprung and there light weight flywheel and 3 inch turbo back exhaust.
 

jpmxrider489

Supporting VIP
2,395
130
Apr 4, 2010
pittsburgh, Pennsylvania
You'll need bigger injectors, turbo, and all supporting mods including dsmlink. You'll want to do all preventive maintenance like timing welt, waterpump, and ect to keep everything new.

In my opinion, 400whp isn't easily obtained with a stock motor. My stock motor spun a bearing around 370 although link said my 20g did 40lb/min. I would say around 320 could be a safe reliable number to be reliable.
 

EC17PSE

Freelancer
5,649
2,998
Nov 1, 2008
London, UK, Europe
Good supporting mods! E316g is possible but hard in stock form. But a 20g would be better, a really good tune with ecmlink for basics unles you wish to go aftermarket ecu and spend more money?

Supporting mods will include some basics like logging gauges, fuel pump, afpr, injectors.
Exhaust will be bigger and free flowing (no cat if doable)
Well maintained engine with fresh oils and trans fluids and timing with good oem parts. Use mitsi belts from the evo 9 kevlar or aftermarket belts.

Good cooling as power will create heat so good thermal barriers and covers and alloy rad and good silicone hoses to support the new coolant pressures.

Jumping to 400hp will set you back about 4-5k ish or more if you dont find deals. Thats not inc tune time for someone to do that!

Plus it dont include install from someone either so you have to k ow what you are doing to save the funds in the right places.

Stock block can handle that but dont go past 25psi as you might run into problems and its a precaution really vs being a limit. Good headstuds will help also along the way
 

pboglio

15+ Year Contributor
1,799
83
May 8, 2004
Palos Heights, Illinois
It would be hard on the engine. At that power level I broke a clutch spring and also had what felt like crank walk before I parked it permanently. That setup had maybe 30-40k miles on it (+140k miles). A torque limited tuning would definitely have improved the reliability but the E316g wasnt helping matters much. I feel like 350 w.h.p. would be a better compromise with a solid tune.
 

Spleen8urLSX

5+ Year Contributor
321
214
Dec 26, 2017
Elyria, Ohio
I made over 400 cramming boost into a stock non turbo 6 bolt bottom end for several seasons and several thousand street miles beating the absolute crap out of it, take that as you will. Tune and current condition of the engine are the biggest factors, there’s more than one way to skin a cat but ECMlink is the easiest option.
 

2g_Shaun

Probationary Member
14
0
Oct 11, 2022
Rio Rancho, New_Mexico
You'll need bigger injectors, turbo, and all supporting mods including dsmlink. You'll want to do all preventive maintenance like timing welt, waterpump, and ect to keep everything new.

In my opinion, 400whp isn't easily obtained with a stock motor. My stock motor spun a bearing around 370 although link said my 20g did 40lb/min. I would say around 320 could be a safe reliable number to be reliable.
Ya i recently did a brand new oil, trans fluid, coolant flush, water pump, timing belt, tensioners, new o2's, rear and front main seal, upgraded spark plug wires, new spark plugs. I plan on getting a cometic head gasket and arp head studs, upgraded fuel pump, cx racing turbo manifold with 16g turbo, cx racing front mount intercooler kit, ecmlink ecu. Im sure my clutch is more than enough for the torque with it being a 6 puck to.
 

2g_Shaun

Probationary Member
14
0
Oct 11, 2022
Rio Rancho, New_Mexico
Good supporting mods! E316g is possible but hard in stock form. But a 20g would be better, a really good tune with ecmlink for basics unles you wish to go aftermarket ecu and spend more money?

Supporting mods will include some basics like logging gauges, fuel pump, afpr, injectors.
Exhaust will be bigger and free flowing (no cat if doable)
Well maintained engine with fresh oils and trans fluids and timing with good oem parts. Use mitsi belts from the evo 9 kevlar or aftermarket belts.

Good cooling as power will create heat so good thermal barriers and covers and alloy rad and good silicone hoses to support the new coolant pressures.

Jumping to 400hp will set you back about 4-5k ish or more if you dont find deals. Thats not inc tune time for someone to do that!

Plus it dont include install from someone either so you have to k ow what you are doing to save the funds in the right places.

Stock block can handle that but dont go past 25psi as you might run into problems and its a precaution really vs being a limit. Good headstuds will help also along the way
Ya i have done every bit of service for the engine. My next step was to do cx racing 16g turbo and manifold, cx racing front mount intercooler kit, bigger injectors and fuel pump, Arp head studs and cometic multi layer head gasket, ecm link/ or haltech 1500, Mishimoto rad hoses and rad.
 

Spleen8urLSX

5+ Year Contributor
321
214
Dec 26, 2017
Elyria, Ohio
Ya i have done every bit of service for the engine. My next step was to do cx racing 16g turbo and manifold, cx racing front mount intercooler kit, bigger injectors and fuel pump, Arp head studs and cometic multi layer head gasket, ecm link/ or haltech 1500, Mishimoto rad hoses and rad.
If you want reliability stay away from the China 16g and tubular manifold. If your stock 2g manifold isn’t cracked from old age and several heat cycles, port it and it won’t just be less prone to cracking like the crappy tubular chinafold but will flow and perform better too. As far as the 16g goes spend a little more and get a real MHI 16g. Even a used one is likely to last longer than a China one that typically only lasts a few thousand miles turned all the way up.
 

2g_Shaun

Probationary Member
14
0
Oct 11, 2022
Rio Rancho, New_Mexico
If you want reliability stay away from the China 16g and tubular manifold. If your stock 2g manifold isn’t cracked from old age and several heat cycles, port it and it won’t just be less prone to cracking like the crappy tubular chinafold but will flow and perform better too. As far as the 16g goes spend a little more and get a real MHI 16g. Even a used one is likely to last longer than a China one that typically only lasts a few thousand miles turned all the way up.
Oh I see. Cx racing is all China stuff?
 

jpmxrider489

Supporting VIP
2,395
130
Apr 4, 2010
pittsburgh, Pennsylvania
If you are wanting 400whp, on a stock motor, which is pushing the limits, you don't get that by putting cheap parts on. A small 16g wont get you there. You could look in the classified on here and look for a 20g setup. I had a 20g, very fun all around turbo. You could look into a VRSF intercooler kit. You could look into 1000cc injectors. If your on a budget, PTE injectors could be had. For a fuel pump, wally 255 should do. And with a bigger fuel system, you'll need to regulate it as well. Then look for dsmlink in the classifieds to. That's the main bullet points. You said the matenaince has been done, so does that mean new water pump, timing belt, balance shaft belt, timing tensioner, and ect? I didn't cover the clutch at all here. But your stock clutch will probably not handle it.
 

Sniffbooger

Proven Member
308
132
Apr 12, 2020
Torrance, California
Oh I see. Cx racing is all China stuff?
YES!!! I have the CX tubular manifold and the CX 16g on my GST and that tubular manifold gets hot and warps at high temp, and it kept pulling and loosening the nuts, and even stripped a stud off my head, now its got an exhaust leak and I have to take off the head to a machine shop to drill out the broken stud. Get a stock manifold ported, or an FP exhaust manifold, and a real MHI EVO III 16G. Or a 20G, even better for max HP on pump gas.
 

99dsmer4g63

Proven Member
173
86
Sep 20, 2022
Shippensburg, Pennsylvania
A healthy 7 bolt will take 400hp no problem. It’s the 7 bolt rods that are weak. They don’t like torque. I’d be more worried about drivetrain at 400 than the motor.

I personally run 430 on a stock 7 bolt bottom end and about to raise it 440. More to come after this winter when I switch to E85 and up the boost.

Get your self a good tuner. @gofer runs about the same power as me on a stock 7 bolt bottom end as well. I don’t have balance shafts and he does.

-Daniel
 

Mikesam

Probationary Member
21
13
Feb 23, 2022
Kennewick, Washington
You'll need bigger injectors, turbo, and all supporting mods including dsmlink. You'll want to do all preventive maintenance like timing welt, waterpump, and ect to keep everything new.

In my opinion, 400whp isn't easily obtained with a stock motor. My stock motor spun a bearing around 370 although link said my 20g did 40lb/min. I would say around 320 could be a safe reliable number to be reliable.
I am pushing 30psi of boost with a hx35/40 hybrid with all supporting mods making around 425hp in a 7 bolt, and all I have done engine wise is head studs.
 

2g_Shaun

Probationary Member
14
0
Oct 11, 2022
Rio Rancho, New_Mexico
If you are wanting 400whp, on a stock motor, which is pushing the limits, you don't get that by putting cheap parts on. A small 16g wont get you there. You could look in the classified on here and look for a 20g setup. I had a 20g, very fun all around turbo. You could look into a VRSF intercooler kit. You could look into 1000cc injectors. If your on a budget, PTE injectors could be had. For a fuel pump, wally 255 should do. And with a bigger fuel system, you'll need to regulate it as well. Then look for dsmlink in the classifieds to. That's the main bullet points. You said the matenaince has been done, so does that mean new water pump, timing belt, balance shaft belt, timing tensioner, and ect? I didn't cover the clutch at all here. But your stock clutch will probably not handle it.
yes all that stuff done and the clutch is a action 6 puck sprung with light weight fly wheel.
 

2g_Shaun

Probationary Member
14
0
Oct 11, 2022
Rio Rancho, New_Mexico
YES!!! I have the CX tubular manifold and the CX 16g on my GST and that tubular manifold gets hot and warps at high temp, and it kept pulling and loosening the nuts, and even stripped a stud off my head, now its got an exhaust leak and I have to take off the head to a machine shop to drill out the broken stud. Get a stock manifold ported, or an FP exhaust manifold, and a real MHI EVO III 16G. Or a 20G, even better for max HP on pump gas.
ok cool i wont do cx racing.
 

2g_Shaun

Probationary Member
14
0
Oct 11, 2022
Rio Rancho, New_Mexico
I am pushing 30psi of boost with a hx35/40 hybrid with all supporting mods making around 425hp in a 7 bolt, and all I have done engine wise is head studs.
how is it holding up? and have u had any issues?
 
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