Boostfarmer

iTrader: (2)

Hey so Ive been reading a lot about where I want my new tune and the numbers I'm seeking. I want 415-420whp/400tq. Now I'm hearing a lot of people warn against going above 400 tq on stock motor? I want to know if rod bolts would help cure this problem if installed the correct way?

What are the serious problems of 400TQ? and if I was at 385 or 390 tq not to be a smartass but is it just 400+ or can you get really close to 400 and have a stock motor last?

Sorry I know these maybe noob questions just dont want to ask anything of a tuner that will mess my car up thanks guys

Tekniq

iTrader: (11)

I would like to know the answer to this as well.

prowakeskater

iTrader: (14)

quite a bit of people are beyond 400. Pick a real, real good tuner. **cough cough**

one is over 500awtq. stock block.

lots of factors are involved. research

PatricksEvilEvo

iTrader: (12)

The general consensus here is 400tq is the safe cutoff. It's all about who tunes the car too, you can have a 400hp/tq car last a while or it could pop at 350tq.

If you're going to swap rods why not go all the way.

JohnBradley

iTrader: (30)

When I started preaching the 400tq "limit" 4 years ago it was based on the following observations-

400 ft lbs went 55k problem free (COMPLETELY stock bottom end)
425 went 12,000 and lost a headgasket
470 went 3 weeks then BOOM
491 went 3 days then BOOM

The thing all these cars had in common is that they were doing it on stock or stock appearing turbos and making peak torque EXTREMELY low. On my car I started tuning for peak torque as high as I could get it and still keep it from being lame on the street.

When I stopped and thought about it, did some math, I realised that if you make 400 ft lbs at 3500 rpm you might have a BMEP (cylinder pressure) level of let's say 600psi. If thats the number that is the mean average for safety 600psi BMEP at 6500 is 510 ft lbs. There is no magic number as was stated below this but there is definitely some common sense limits that prevent failure.

Aaron

Boostfarmer

iTrader: (2)

So would you say at 380-390 on a great tune id be safe? I really want tq LIKE ITS ALL I WANT FOR CHRISTMAS. IS 100TQ 100TQ ALL I WANT FOR CHRISTMAS IS 100TQ 100TQ 100TQ

I wanna go beat some good cars out there and tq is how im finding you get the job done.

lol hope you enjoyed my new song mp3 version will be out soon

Raptord

iTrader: (10)

There's no magic line like "399 is perfectly safe, 400 will blow up in a week". Anytime you have more power than stock, you're gradually increasing the risk of something going wrong. You have to decide how much risk you're willing to take. As mentioned, 400wtq that doesn't hit too soon *should* be a reasonable compromise between risk/power.

lostsoulsevo

iTrader: (10)

i believe its all on the turbo setup, stock appearing turbo's spool sooner vs a bigger t3 turbo (6266) power is more up top.

Boostfarmer

iTrader: (2)

well I was hoping with an evo9 turbo and gsc2 cams I would hit those numbers on e85 Im at 338/312 currently but was suffering from a o2 housing to downpipe leak and it was really bad. Turner said if the leak was fixed I could have hit 325/330 tq But with those mods added to the set up plus a licp and o2 housing not dump =(.

Hoping to be around 400/400 would be nice so with an 9 turbo getting the power the tuner can just curve it to be a little more high end? So its a mass of low end tq that cause damage?

prowakeskater

iTrader: (14)

is that on a mustang? 9 turbo on e85 should yield 400 tq easily on s2s. Might want to get a better tuner

Boostfarmer

iTrader: (2)

I feel my tuners really good? I was more stating that it was my hopes to hit 400/400 with current mod list. I dont have any of them on yet lol. I just wanted to see if it was safe being at those numbers before I went and got 400/400 Im sure he could give me some of the best numbers out their. I just wanted to know how safe the numbers hed put me at would be safe its not my dd but I dont wanna build it for a long time.

JdmEvo818

iTrader: (3)

Well ive been running 510hp amd 486tq on my evo with old style fp green and my evo is still running strong i drag the car constantly launching my evo at 5.5k i dont dump the clutch so knock on wood lol well i honestly think it depends on your tuner my tuner is good as hell i wanna more power but i was at the limit so i honestly think it really depends on your tuner how reliable he does your tune !!!! Good luck

JohnBradley

iTrader: (30)

I've seen motors fail at 360 and others make 440 tq without issue. Like I said above its about where it does it in the powerband and how much timing is being used to make the torque. Timing is way more devastating to the stock components than boost. The last thing I need to mention is this was all dynojet based numbers, your results may vary depending on dyno.

Aaron

prowakeskater

iTrader: (14)

just have the torque hit later. You can have 450 safeishly after 5k. Timing and boost manipulation will achieve this.

highbredcloud

iTrader: (2)

Before I blew my 2.OL the car made 412RWHP and about 385RWTQ on a mustang dyno...so about 450-460 RWHP on dyno jet about about 420-430 RWTQ...I had rod bolts but stock bottom end with about 50K original miles...ended up destroying my block as piston#4 and I think #2 shot right through the block...I was in 5th gear going about 80 MPH on a highway trying to make a pass...way above 4,000 RPM...

Reason why I say this is...I was told that you need to be aware of your TQ while in higher gears especially 5th gear...My block lasted about 30,000 easy miles...I don't beat on my car so having it blow up crusing in 5th scared the sh*t out of me...Basically you are playing with fire...TQ is what will kill your block...but TQ is also what makes a FUN street car...again...you can lower the TQ but the fun factor in driving goes down...so at the end of the day what do you want from your car? I would invest in a bottom end...if you have low miles on your evo...it shouldn't be that much more when you do rod bolts...It would have cost me less than $1200 to do rods and pistons at the time I was doing rod bolts but I had to spend thousands to learn that lesson the heard way...good luck...