Hi

I have a chance to buy a near complete TEC 2 system and 3.2 manifolds. I plan on adding 964 cams, K27 and match porting the intakes ports. But that is all I was planning on doing to the internals.

How much power will the stock engine take before starting to do damage?

Is the money better spent on the stock CIS mods?

The motor has a fully documented rebuild with about 18K miles with good compression and leak down numbers.

Thanks

 

It has been said by Stephen of Imagine Auto that the stock rod bolts are the weak point of the stock engine and that they are limited to 400bhp at the flywheel.

You really need to fit ARP or Raceware rod bolts. Next is the headstuds.

 

The stock bottom end is stout as long as the rod bolts are replaced as mentioned above. I ran one at 521hp@1bar on MoTeC EFI for 6 years with no issues upon teardown inspection.

The TEC II will only support single plug, so you'll be limited there. It also does not have the air temp compensation a turbo engine requires for consistent fueling and the 8x8 table is too small for optimum ignition control.

 

To jump in here....

Does anyone have a list of what stock stuff need to be replaced in order and of HP.. for example
1) Rod bolts upto 525HP ish..
2) Head Studs upto 600
3) Con rods to 650 etc...

 

I ran a Tec 2 on my engine and it does support MAT and I had a twin plug set up. I have since gone to a Tec3r. Money is always an issue but I would spend it now and go to the Tec3r. There are many advantages 16X16 table full sequential injection better idle circuits real time tuning. I am now running 733rwhp with no issues. I was running 555rwhp with the Tec2 without issues. Again I would go with the newer EFI units there are many on the market and a lot of info on this board about them. I was running stock rods with Arp rod bolt with 555rwhp and switched to Pauter Rods when I could not resist more Hp. Plan ahead, plan ahead, plan ahead! spend it now do not end up redoing it later. Just so you know you car was made to run 282hp and when you increase hp other things come into play like clutch, larger intercooler, fuel system (high hp) Larger wheels and tires possible differential up grade (LSD these cars get squirly when they come on boost and start spinning the tires. I went to a Quaife and now it stay straight when the tires let loose.) If you buy the Tec2 and manifold wth out going nuts can be made to work but is it money well spent?

 

EFI is never a waste as long as you understand the limits of the motor you are placing it on. In this case if the car makes more power under the curve and you have to limit boost to control the power output then so be it. The gains would stillbe worth it if the cost to buy the EFI conversion was cheap enough.

You don't have to make BIG HP...We all get caught in the I have to have X amount of HP game.

 

I built a car several years ago and had to use the TEC1 because it was dual plug. The TEC2 did not support dual plug. It did however have a MAT function. The problem with the rod bolts is the diameter of them is not strong enough for engines that see high revs for sustained periods of time. I personally think your application would be fine with the stock rod bolts. But, if you are going to tear it down anyway, I would definately replace them.

 

Here's my experience. My car had stock stock bottom end with 400+ hp to ground for 4 years (and raced) with no issues. The thing noticed on tear down was that some of the heads were floating a little. You could see exhaust lines on head mating surface near edge of exh valve.

What will this,
"I plan on adding 964 cams, K27 and match porting the intakes ports."
get you? ...depending on IC, exh, with fuel head mod/fuel enrichment --> 400hp to ground (on CIS!)

 

Thanks for the input. My goal is about ~ 400RWHP. Based on the feedback, I think this is the limit for both the stock motor internals and TEC 2 system for on long term reliability....

I am transplanting everything from a 79 930 to my early tub that will be used for street and track.

 

$00RWHP is far different than 400 Crank. Time to do some upgrades if that is the goal.

 

I should have said I had a Tec1 with a Tec 2 chip.