Does anyone run the Hypertech Thermomaster chip? If so is it worth it, it says it has the same things as the Street Runner chip but with things to help with cooling. I know I'll get the fan temp switch and a lower temp thermostat just wondering if the chip would be overkill.

 

The only thing it would be overkill on is your pocket book. For the price of one of those chips you could get the equipment to start burning your own chips and make your car run even better. Check the boards about aftermarket chips and you'll see what I'm talking about.

 

Buying a chip from Hypertech is a waste of money like the above guy said. Burning a custom chip is the best option but it costs a little bit of change to get started and there is a lot to learn about the customizing. You might be able to find someone one the board to burn you a chip with just the cooling options you want. There would still be a fee but not like 150 or 200 or whatever hypertech wants for them.

With custom chips you can really increase the performance of engine and fuel mileage. But custom chip burning isnt for everyone. Check out the DIY Prom board and the EFI & ECM board. You will get a better idea on the subject.

 

buy their fan switch tho!

 

Hey duke....i just picked up a 92 z and i have the thermo master chip installed...i could tell the difference right away..shifts were a little firmer and it moved out a bit quicker...nothing radical but you could tell the difference..plus my fan turns on sooner....as far as chip burning goes i have no idea...i will probably get into that as the levels of my mods increase..but all i have right now is a cat-back and chip..thats about it....good luck bro...

 

I just installed a termomaster chip in my IROC, the only reason I did was for the feature that turns the fans on sooner, working good so far and I estimate that I got about 5 to 10 more horse our of it.
As for the $, sure I could have spent less and burned my own but I have enough hobbies already taking up my time, who needs one more.

 

I'm with Viking on this one. Yes is true you'll get better results from a custom PROM. But, do you have the time to mess with that? If you do more power to you. On the other hand the Thermo-Master is a basic chip that will change the fan(s) turn on temperature, change shift point up a little, change the spark curve some and a few other things. I run one in mine cause I don't have the time to burn my own and in Florida you need every bit of cooling you can get. As far as performance it does make some difference but not something radical. For a daily driver in and out of traffic I say it does its job provided the rest of the cooling system is in good shape to keep the coolant temp down.

 

I went to Autozone yesterday and asked about the chips. They have both the Street Runner and the Thermomaster. The Street Runner was $90 and the Thermomaster was $118. I thought they would be more expensive than that. But they didn't have the fan temp switch or the thermostat so I couldn't price them. But I was thinking about and I'll probably have to have one custom made anyway since I'll be swapping my 305 for a 383 (as soon as I can) unless the chip for the 350 would work with it.

 

correct me if I am wrong but you should not need the fan switch with the hypertech thermomaster. I have a thermomaster in my 89 and it is reprogramed to turn the fans on at about 170 to about 180. it does this with the stock fan temp sending unit. from what I understand about the after market sending units (fan switch) is they fool the computer into thinking you are around 225 when you are really around 180 by sending the same amount of resistance at 180ish that the sock sending unit would send at 225ish. seems to me if you had both your fans would be on as soon as you start your car.

Rich

 

Under normal operation without the A/C or defroster running the secondary fan is controlled only by the fan switch, and the primary fan is controlled by the ECM. Both settings are on@176-off@166.
With the A/C running, the fan request signal is sent to the ECM by the A/C pressure switch and in turn the ECM runs "both" fans regardless of coolant temperature.
So the ECM has partial control of the secondary fan also.

Source: Hypertech Tech Support

The fan switch is not a resistance switch, instead it is a grounding switch. It is either open or closed.

 

I agree with Ozzy on that one, that is exactly how my 89 works. There is a new sender that you can use for the 2nd fan though, replaces the stock sender on the passenger side head. I beleive it is hypertech part # 4028

 

Like I said correct me if I am wrong. Now that I think about it my secondary fan does perform the same as before I had the hypertech switch in it. So from what you are saying if I put the hypoertech fan switch in my secondary fan will run the same as my ECM controlled primary fan?

Rich

 

Here is the message from the tech guy:
Since the turn on temps of the switch and the pre-programmed setting are the same the fans will turn on about the same time. The are small temperature differences between the location of the fan switch and the coolant temp sensor which is where the ECM gets the reading from.
As far as your switch there could have been an internal fault in it and it would close at a lower temperature than it was rated at. That just seems a little odd since the stock switch is rated at 195 deg.
Your guess is just as good as mine.
Later,
Ozzy

 

I'm interested too in a Thermomaster chip for my 86 IROC. My IROC has a single fan and it turns on about 240F (californian model). Its 'too hot for my poor stock engine. I'd like to put a federal thermomaster chip, because in France, there's no law about pollution for cars made before 1992. But my problem is, there are 2 federal Thermomaster for 1986 305 TPI with auto trans :
#126002
#126012
Who can explain me what are the differences beetween them?